THe religious one is very easy. I've never had it questioned, even though ds had his shots until 12 mos. One school sent a notice that ds was behind. I just highlighted the religeous exemption part of the from, signed it, and never heard a word about it again.
My mom claimed it for me too, because couldn't get medical, even though I had a reaction to the DPT.
THe only problem I had growing up was being quarantined when measles was going around at my school. I'm sure kids with medical exemptions would ahve been sent home also.
Oh, and no-one can ask you what religion you are either.