No prophet? Are you certain about that?
There are quite a lot. However, just to name a few.
Moses
(Exodus 23:13) “You must be careful to do all that I have said to you, and you must not mention the names of other gods; they should not be heard on your lips.
(Deuteronomy 7:16) You are to destroy all the peoples whom Jehovah your God gives over to you. You must not feel sorry for them, and you must not serve their gods, because that would be a snare to you.
Elijah
(1 Kings 18:21-22) 21 Then E·liʹjah approached all the people and said: “How long will you be limping between two different opinions? If Jehovah is the true God, follow him; but if Baʹal is, follow him!” But the people did not say a word in answer to him. 22 E·liʹjah then said to the people: “I am the only prophet of Jehovah left, while the prophets of Baʹal are 450 men.
Jeremiah
(Jeremiah 11:17) “Jehovah of armies, your Planter, has declared that a calamity will come upon you because of the evil committed by the house of Israel and the house of Judah, who have offended me by making sacrifices to Baʹal.”
Hosea
(Hosea 2:13) I will hold an accounting against her for the days when she offered sacrifices to the Baʹal images,. . .
Zephaniah
(Zephaniah 1:4, 5) 4 “I will stretch out my hand against Judah And against all the inhabitants of Jerusalem, And I will wipe out from this place every vestige of Baʹal, The name of the foreign-god priests along with the priests, 5 And those who bow down on the rooftops to the army of the heavens, And those who bow down and pledge loyalty to Jehovah While pledging loyalty to Malʹcam;
All the prophets actually described how God was indignant because his people accepted the worship of other nations around. (2 Kings 17:7-18)
Interfaith was condemned by God, from the inception of prophets, until now.
In fact, the Israelites were not only to refuse associating with those nations, and sharing in their worship, but they were required to pull down all their sacred pillars, and reduce them to rubble.
The apostles too needed to avoid false worship.
Paul said...
"Do not become unevenly yoked with unbelievers. For what fellowship do righteousness and lawlessness have? Or what sharing does light have with darkness? Further, what harmony is there between Christ and Beʹli·al? Or what does a believer share in common with an unbeliever? And what agreement does God’s temple have with idols? For we are a temple of a living God; just as God said: “I will reside among them and walk among them, and I will be their God, and they will be my people.” “‘Therefore, get out from among them, and separate yourselves,’ says Jehovah, ‘and quit touching the unclean thing’”; “‘and I will take you in.’” “‘And I will become a father to you, and you will become sons and daughters to me,’ says Jehovah, the Almighty.” - 2 Corinthians 6:14-18)
" No; but I say that what the nations sacrifice, they sacrifice to demons and not to God; and I do not want you to become sharers with the demons. You cannot be drinking the cup of Jehovah and the cup of demons; you cannot be partaking of “the table of Jehovah” and the table of demons. Or ‘are we inciting Jehovah to jealousy’? We are not stronger than he is, are we? - 1 Corinthians 10:20-22
God gives people who are associated with false religion, the warning, to get out... leave, before it is too late.
Revelation 18:4 - And I heard another voice out of heaven say: “Get out of her, my people, if you do not want to share with her in her sins, and if you do not want to receive part of her plagues.