Ruling on the call to unite all religions

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

What is the ruling on buying from the kuffaar when there are Muslims around?

He became Muslim and he has kaafir friends

When they need to write the Gregorian date

Whoever does not believe that the kaafirs are kaafirs is himself a kaafir

A Christian complains about prohibition of Muslims celebrating or congratulating people at Christmas

He is invited to go places with the kuffaar

Convert attending his brother’s wedding party

Ruling on obtaining nationality of a kaafir state