Yes, churches began on the day of Pentecost shortly after Christ returned to heaven.

It does not have to be capitalized, but it is perfectly fine to do so.

It means that religion is separate from politics and goverment.

A little something called "separation of church and state" prohibits something like that from becoming law. As much as evangelicals try to change it, they have, thus far, failed (fortunately). The churches themselves may impose a dress code, but it's not a matter of law.

The French football champions in 1905 was Roubaix.