Jumuah

Performing Jumu'ah Salah in a church

Q: Due to space restriction in an existing Masjid, is it permissible for Muslims to perform Jum'ah Salah in a church on the basis that some brothers argue that the whole earth is a Masjid and provided that any items pertaining to shirk are covered, there is no problem in performing Salah in a church? If it is not permissible please advise why with Shar'i evidences so that the matter can be addressed with the proofs in front of us?

Missing Jumuah Salaah due to college classes

Q: It is often said that, for a man in particular, missing 3 Jummah Salahs in a row eliminates him from deen. My question is that living in a foreign country, if someone misses them because there is no Mosque within miles, and the time of Salah clashes with the man's college classes. What does the Shari'ah say in these circumstances? In the namaz, is it not permissible for one to say Bismillah after Surah Fatiha (Before starting the second surah)?

Jumuah Salaah in other places besides a Musjid

Q: Bahishti Zewar chapter about the Jumu’ah and Eid Salaah: "To offer jumu'ah salaat openly and with full permission. It will not be permissible to offer jumu'ah salaat in any private and secluded place. If jumu'ah salaat is offered at such a place where the general public is not allowed to come or the doors of the musjid are closed at the time of jumu'ah, the salaat will not be valid." 

Can we offer the jumuah salaat in a place other than a musjid?