Nothing that we wouldn't already have assumed about them (//http://www.vice.com/read/i-spent-a-decade-working-for-churches-and-it-was-the-worst).
No shitsky. Been there. Was a Boy Scout Assistant scout master, secretary in a Elder's Priesthood Quorum, Youth group leader and assistant pastor as a Christian, did volunteer work like cooking turkeys and preparing meals for shut ins on Thanksgiving, painted an entire recreation room of a church single handed because the other guy was suddenly unavailable, shit like that. I wish I had back all the money I've donated, not just from tithing. That would pay for a Harley Davidson, for fucks sake.
Nothing like being at the beck and call of first a Mormon bishop and then a Christian pastor who was never there, and having to deal with issues without having the means to do so. Fun shit.
A lot of the atheists I've met in person are people who used to be super-dedicated Christians.