Chance to better theism

[Strongbad]

I don't understand at all not supporting or encouraging any type of relationship. I can see it could cause problems, but that doesn't mean you segregate.

In that case, I might suggest that you teach the class to disregard what the bible says about segregating themselves from “unbelievers”. To wit:

2 Corinthians 6

14Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? 15What harmony is there between Christ and Belial? What does a believer have in common with an unbeliever? 16What agreement is there between the temple of God and idols? For we are the temple of the living God. As God has said: "I will live with them and walk among them, and I will be their God, and they will be my people."
17"Therefore come out from them and be separate, says the Lord. Touch no unclean thing, and I will receive you." 18"I will be a Father to you, and you will be my sons and daughters, says the Lord Almighty."

Alternatively, you might teach them that this passage doesn’t actually mean that Christians should not be yoked together with wicked unbelievers, but it really means that they should love all people from all other beliefs, including atheists, and that they should seek the fellowship of all men. In other words, don’t take it literally.