Dealing with Christian neighbours

Question: How should I deal with my Christian neighbors or classmates? Should I visit and congratulate them on their religious occasions?

Answer: It is permissible to treat Christian people who are at close proximity to you, neighbors or classmates, gently and help them do lawful things. It is also permissible to visit them with the intention of calling them to the way of Allaah, so that Allaah may guide them to Islaam… read more here.