Exactly what Tin Man said. To bar the Out Of Context™ escape hatch, show him the actual Buybull verses, and to bar the impending It Was Mistranslated And Originally Meant X™ escape hatch, point out that the old versions of the Buybull are under lock and key by the Vatican, and thus he has no evidence to back up that assertion.

In case he tries to deflect with the What About Islam™ escape hatch, then also mention the Koran’s draconian policy on homosexuality and “adultery” immediately after mentioning the homophobic Buybull verses, and using this, point out that his religion and Islam are both the same pile of dog shit. If he tries to argue that atheism is also Just As Bad™, then point out that unlike religion, it doesn’t have any absolute dogma that teaches people to hate, and call him out on this false equivalency.

If he tries to run away with the classic No True Scotsman escape hatch, then point out that a) he’s selfish for trying to make this all about his image, b) if he really doesn’t think that the followers of those Buybull verses are not True Christians™ then he should tell that to them and not you, and c) he doesn’t get to pretend that the followers of his religion whom he finds personally distasteful are not True Christians™ to make himself feel better.

If he tries to rationalize it away by shifting the goalposts, then remember that he will be subject to Rohan’s Law, which states that the farther you push an apologist, the more exploded and outlandish their claims will get- thus making him easier to trap