Is
      it permissible to go into churches for the purpose of da’wah, or just to
      look around?
Question

                There are many churches here.
      Is it permissible to go into them to hold discussions with the priests
      there? Is it permissible to go in just to look at them and see what the
      people do there?
Praise be to Allah.It is permissible for scholars and knowledgeable
      people to enter churches in order to call the people there to Islam. But
      we should not enter them just to look around, because there is no benefit
      in doing so, and there is the fear that the Muslim may be influenced by
      them, especially if he is ignorant about his own religion and cannot
      refute the confusion that they will direct towards him.