Scholars entering churches to practice Da`wah (call to Allaah) therein

Question 62: There are many churches here. Is it permissible to enter them to hold discussions with the priests? Is it permissible to enter them just to look at them and see what the people do there?

Answer: It is permissible for scholars and knowledgeable people to enter churches in order to call the people to Islaam. However, we should not enter them just to look around…. read more here.