I was taking a walk with my fingers on quora where I found this question. I don’t know if the poster was serious or people have asked all the possible questions and this is what remains unknown. So in the interest of the Christians who visit this humble site, here is my advice.
1. Do not be unequally yoked as Paul said
2. Don’t touch them with a mile long pole
3. Spray holy water everywhere they come into contact with
4. Pray for them without ceasing, your life depends on it.
5. Preach and attempt to convert them.
But if you are a decent human being, treat them as you would treat another person, with respect. Don’t be an ass. Your religion is like your genitalia, good to have but you should only show those who are interested.