The written law is replaced with the law of love and the Holy Spirit who guides and teaches us.
The Law of Moses is taken out of the way as a means of salvation. The Law is something that we cannot fulfil to the letter but we can fulfil the requirements of the law through loving God and our neighbour.
The feast of Pentecost is when the Law was given to Moses and 3000 lives were lost on that day. The Pentecost after Jesus rose was when 3000 people were saved and when the Holy Spirit was given.
It seems strange to base your beliefs on a prophecy which seems easily misunderstood.
Have you read commentaries on the Zechariah prophecy and alternative meanings.
Personally I see that Jesus said that it is in the true Church that the tares will remain until the end when the angels would be sent to gather them out and burn them. It would be great if the Church was perfect but it is not perfect and there are false Christians in the Church and it is up to Jesus to be the judge of that.
If you read Ezekiel 34:20-23, in which the "Lord God" will do the judging, when he delivers them, and then set over them one shepherd, "David". Per Ezekiel 36 & 37, Judah and Ephraim remain apart, and have not been delivered as of this time. Historically, Judah, the Jews have been given Judea in a degree, but Ephraim remains scattered among the nations (Ezekiel 36:19). As for the true church, which keeps the commandments of God and holds to the testimony of Yeshua, they will be hidden from "dragon"/devil for time, times and half a time, which will be the time span of the Roman church of Constantine, before it falls (Daniel 7:25 & Revelation 12:14-17). And the tares, which are compared to the ones who "commit lawlessness" (Matthew 13:41-42), they will be "first" gathered to be thrown into the furnace of fire, and then the wheat will be gathered into the barn. This is the exact opposite of what most Protestants are taught. As for Catholics, they are only taught to listen to the pope, whose reign is coming to an end, and his followers will be "cut off" (Isaiah 22:25). As for keeping the commandments, Yeshua said it is not hard to do. (1 John 5:3) & (Matthew 19:17)
There is a difference between the tare seed and the tares, and the good seed, and harvested wheat, sons of the kingdom.. The "good seed" is the seed (message sown by the son of man) (Matthew 13:37), and tare seed, is the message of the "devil", by way of his false prophets, which produces tares, sons of the devil. At the end of the age, the angels will separate the "wicked"/lawless from the righteous, and throw the "wicked"/lawless, into the "furnace of fire" (Matthew 13:47-50). The wicked/lawless, may be among the righteous, just as the message of the devil, and his false prophets, is in the same field/book, as the message of the son of man. Those of the light, choose the light, and those of the darkness, choose the darkness. If you want to understand real scripture, you have to throw out the tare seed, the messages of the false prophets, whose "foremost" is Paul.
King James Version
For this is the love of God, that we keep His commandments. And His commandments are not burdensome.