Do you know which country persecutes Christians the most?

I dont think so, just dont be offended by their response as it may well not be what you are looking for, and it is appropriate that an evening ends on good terms.

That said, I would go for it. If they dont know Jesus as Lord and Saviour, they are going to hell. If you dont tell them of the Gospel, how else will they hear of it? Does God require it of you to tell them?

What I would do is to have a discussion on who they think Jesus is. In the Koran it says that Jesus was born of a Virgin, maybe you could ask them why the Koran says that, and what that suggests about Jesus as to whether He is the same as earthly born men or not?