I studied the Jim Crow era, so this is a bit late for me. Check out: http://www.pbs.org/wnet/aaworld/timeline.html
1. Mostly Baptist.
2. Christian holidays... Christmas, Easter... Also New Year's, Thanksgiving, etc. Government holidays. There's debate about how widely and genuinely Kwanzaa was adopted. It's founder Maulana Karenga is a very polarizing figure. Middle class blacks were put off by his militant attitudes. And Juneteenth: http://www.juneteenth.com/
3. Typical Christian wedding. Not sure how prevalent "Jumping the Broom" was.
4. Same as everyone else, except there was a heightened sense of being aware of your surroundings and racial "vibes" to try to protect yourself from racial discrimination and violence. Racism was/is an omnipresent part of daily life for most (and not just in the South).
Answered Jan 12, 2012
Edited Jan 12, 2012