Muslims Attending Interfaith Programs and Prayers

Q: Is it permissible for a Muslim to participate in an interfaith prayer or program which takes place in a church, temple, synagogue, or any other place? Similarly, please explain whether it is permissible for a Muslim to pay tribute to a non-Muslim by attending his funeral ceremony or by being present at the burial in a non-Muslim graveyard. 

Lately, there has been a lot of talk and discussion around this issue, and some Ulama of JUSA mentioned that for political interests, it is permissible to take part in such interfaith programs, keeping in mind that we are a Muslim minority living in a non-Muslim country. Hence, in order not to be viewed negatively in the eyes of the non-Muslim government, there is scope of permissibility in deen for a Muslim to take part in such gatherings, where one will also have an opportunity to present Islam to people of different religions. 

The aalim of JUSA also presented the fatwa of Mufti Kifaayatullah (rahimahullah) as his proof for the permissibility of taking part in such gatherings. Does the fatwa of Mufti Kifaayatullah (rahimahullah) show permissibility, or is his fatwa being quoted out of context? Could Mufti Saheb also explain whether taking part in such a gathering will cause one to become a kaafir and come out of the fold of Islam? 

Booking a hotel room for someone who will use it for zina

Q: A person I know does online booking reservation for hotels and rooms for accommodation for 5 star hotels. Some of the clients that approach him are confirmed unmarried adults who want to book rooms for zina purposes. When it is 90% sure that these are unmarried and are booking for unlawful things, if I book the hotel rooms through my website, will it be halaal income or haraam income?

Attending a birthday party

Q: I know birthdays are not halal but if a close person invites me, I need to go. So if I went to a birthday party where there is no music, only relatives and close friends, I will not eat the cake but it seems bad if I don't eat the food they ordered, so if I eat the food will it halal for me? Only to eat the food.