This might be helpful, if you have the time and wish to actually interact with the Scriptural testimony, and not to divert to other verses you have time to display.
"Then Moses said to God, “Behold, I am going to the sons of Israel, and I will say to them, ‘The God of your fathers has sent me to you.’ Now they may say to me, ‘What is His name?’ What shall I say to them?” 14 God said to Moses, “I AM WHO I AM”; and He said, “Thus you shall say to the sons of Israel, ‘I AM has sent me to you.’” 15 God, furthermore, said to Moses, “Thus you shall say to the sons of Israel, ‘The Lord, the God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you.’ This is My name forever, and this is My memorial-name to all generations." Ex.3:13-15
I am sure you remember this section knowing it is the Creator God who led Israel out of Egypt to Mt. Sinai to give them the Ten Commandments.
To the scribes and the Pharisees Jesus tells them:
"And He was saying to them, “You are from below, I am from above; you are of this world, I am not of this world. 24 Therefore I said to you that you will die in your sins; for unless you believe that I am, you will die in your sins.” 25 So they were saying to Him, “Who are You?” Jesus said to them, “What have I been saying to you from the beginning? 26 I have many things to speak and to judge concerning you, but He who sent Me is true; and the things which I heard from Him, these I speak to the world.” 27 They did not realize that He had been speaking to them about the Father. 28 So Jesus said, “When you lift up the Son of Man, then you will know that I am, and I do nothing on My own initiative, but I speak these things as the Father taught Me. 29 And He who sent Me is with Me; He has not left Me alone, for I always do the things that are pleasing to Him.” 30 As He spoke these things, many came to believe in Him.
"In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things came into being through Him, and apart from Him nothing came into being that has come into being. 4 In Him was life, and the life was the Light of men. 5 The Light shines in the darkness, and the darkness did not comprehend it. 6 There came a man sent from God, whose name was John. 7 He came as a witness, to testify about the Light, so that all might believe through him. 8 He was not the Light, but he came to testify about the Light. 9 There was the true Light which, coming into the world, enlightens every man. 10 He was in the world, and the world was made through Him, and the world did not know Him. 11 He came to His own, and those who were His own did not receive Him. 12 But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name, 13 who were born, not of blood nor of the will of the flesh nor of the will of man, but of God.
Jesus proclaims His Deity and as being the Creator - the great I AM of the O.T. prior to His incarnation.
Thus says the Lord, the Holy One of Israel, and his Maker: “Ask Me about the things to come concerning My sons, And you shall commit to Me the work of My hands. 12 “It is I who made the earth, and created man upon it. I stretched out the heavens with My hands And I ordained all their host.
13 “I have aroused him in righteousness And I will make all his ways smooth; He will build My city and will let My exiles go free, Without any payment or reward,” says the Lord of hosts. 14 Thus says the Lord, “The products of Egypt and the merchandise of Cush And the Sabeans, men of stature,
Will come over to you and will be yours; They will walk behind you, they will come over in chains And will bow down to you; They will make supplication to you: Surely, God is with you, and there is none else, No other God.’” 15 Truly, You are a God who hides Himself, O God of Israel, Savior! 16 They will be put to shame and even humiliated, all of them; The manufacturers of idols will go away together in humiliation. 17 Israel has been saved by the Lord With an everlasting salvation; You will not be put to shame or humiliated To all eternity. 18 For thus says the Lord, who created the heavens (He is the God who formed the earth and made it, He established it and did not create it a waste place, but formed it to be inhabited), “I am the Lord, and there is none else. 19 “I have not spoken in secret, In some dark land; I did not say to the offspring of Jacob, ‘Seek Me in a waste place’; I, the Lord, speak righteousness, Declaring things that are upright. 20 “Gather yourselves and come; Draw near together, you fugitives of the nations; They have no knowledge, Who carry about their wooden idol And pray to a god who cannot save. 21 “Declare and set forth your case; Indeed, let them consult together. Who has announced this from of old? Who has long since declared it? Is it not I, the Lord? And there is no other God besides Me, A righteous God and a Savior; There is none except Me. 22 “Turn to Me and be saved, all the ends of the earth; For I am God, and there is no other. 23 “I have sworn by Myself, The word has gone forth from My mouth in righteousness And will not turn back, That to Me every knee will bow, every tongue will swear allegiance. 24 “They will say of Me, ‘Only in the Lord are righteousness and strength.’ Men will come to Him, And all who were angry at Him will be put to shame. 25 “In the Lord all the offspring of Israel Will be justified and will glory.” Isa.45:11-25
"Have this attitude in yourselves which was also in Christ Jesus, 6 who, although He existed in the form of God, did not regard equality with God a thing to be grasped, 7 but emptied Himself, taking the form of a bond-servant, and being made in the likeness of men. 8 Being found in appearance as a man, He humbled Himself by becoming obedient to the point of death, even death on a cross. 9 For this reason also, God highly exalted Him, and bestowed on Him the name which is above every name, 10 so that at the name of Jesus every knee will bow, of those who are in heaven and on earth and under the earth, 11 and that every tongue will confess that Jesus Christ is Lord, to the glory of God the Father." Phil.2:6-11
“Who has performed and accomplished it, calling forth the generations from the beginning? ‘I, the Lord, am the first, and with the last. I am He.’” Isa. 41:4
“Listen to Me, O Jacob, even Israel whom I called; I am He, I am the first, I am also the last. 13 “Surely My hand founded the earth, And My right hand spread out the heavens; When I call to them, they stand together. Isa.48:12-13
“Thus says the Lord, the King of Israel and his Redeemer, the Lord of hosts: ‘I am the first and I am the last, And there is no God besides Me. 7 ‘Who is like Me? Let him proclaim and declare it; Yes, let him recount it to Me in order, From the time that I established the ancient nation. And the events that are going to take place. 8 ‘Do not tremble and do not be afraid; Have I not long since announced it to you and declared it? And you are My witnesses. Is there any God besides Me, Or is there any other Rock? I know of none.’” Isa.44:6-8
"Have this attitude in yourselves which was also in Christ Jesus, 6 who, although He existed in the form of God, did not regard equality with God a thing to be grasped, 7 but emptied Himself, taking the form of a bond-servant, and being made in the likeness of men. 8 Being found in appearance as a man, He humbled Himself by becoming obedient to the point of death, even death on a cross. 9 For this reason also, God highly exalted Him, and bestowed on Him the name which is above every name, 10 so that at the name of Jesus every knee will bow, of those who are in heaven and on earth and under the earth, 11 and that every tongue will confess that Jesus Christ is Lord, to the glory of God the Father." Phil.2:6-11
“For I proclaim the name of the Lord; Ascribe greatness to our God! 4 “The Rock! His work is perfect, For all His ways are just; A God of faithfulness and without injustice, Righteous and upright is He." Deut.32:3-4
"The Lord is my rock and my fortress and my deliverer, My God, my rock, in whom I take refuge; My shield and the horn of my salvation, my stronghold...For who is God, but the Lord? And who is a rock, except our God, Ps.18:2,31
"My soul waits in silence for God only; From Him is my salvation. 2 He only is my rock and my salvation, My stronghold; I shall not be greatly shaken...
My soul, wait in silence for God only, For my hope is from Him. 6 He only is my rock and my salvation, My stronghold; I shall not be shaken. 7 On God my salvation and my glory rest; The rock of my strength, my refuge is in God. 8 Trust in Him at all times, O people; Pour out your heart before Him;
God is a refuge for us. Selah. Ps.62:2, 5-8
"For I do not want you to be unaware, brethren, that our fathers were all under the cloud and all passed through the sea; 2 and all were baptized into Moses in the cloud and in the sea; 3 and all ate the same spiritual food; 4 and all drank the same spiritual drink, for they were drinking from a spiritual rock which followed them; and the rock was Christ. 5 Nevertheless, with most of them God was not well-pleased; for they were laid low in the wilderness." 1Cor.10:4-5
"And coming to Him as to a living stone which has been rejected by men, but is choice and precious in the sight of God, 5 you also, as living stones, are being built up as a spiritual house for a holy priesthood, to offer up spiritual sacrifices acceptable to God through Jesus Christ. 6 For this is contained in Scripture: “Behold, I lay in Zion a choice stone, a precious corner stone, And he who believes in Him will not be disappointed.” 7 This precious value, then, is for you who believe; but for those who disbelieve, “The stone which the builders rejected, This became the very corner stone,”
8 and, “A stone of stumbling and a rock of offense”; for they stumble because they are disobedient to the word, and to this doom they were also appointed." 1Peter 2:4-8
Regarding you question about salvation before and after Christ. It is the same - belief in the promised Messiah:
"Isaiah cries out concerning Israel, “Though the number of the sons of Israel be like the sand of the sea, it is the remnant that will be saved; 28 for the Lord will execute His word on the earth, thoroughly and quickly.” 29 And just as Isaiah foretold, “Unless the Lord of Sabaoth had left to us a posterity,
We would have become like Sodom, and would have resembled Gomorrah.” 30 What shall we say then? That Gentiles, who did not pursue righteousness, attained righteousness, even the righteousness which is by faith; 31 but Israel, pursuing a law of righteousness, did not arrive at that law. 32 Why? Because they did not pursue it by faith, but as though it were by works. They stumbled over the stumbling stone, 33 just as it is written,
“Behold, I lay in Zion a stone of stumbling and a rock of offense,
And he who believes in Him will not be disappointed.” Romans 9:27-33
Yes, that's alot. The evidence that the Bible declares the exclusivity of faith in Christ alone cannot be denied.
"Jesus said to him, “I am the way, and the truth, and the life; no one comes to the Father but through Me." john 14:6
"He is the stone which was rejected by you, the builders, but which became the chief corner stone. 12 And there is salvation in no one else; for there is no other name under heaven that has been given among men by which we must be saved.” Acts 4:11-12
