The only person I've ever known who followed all those restrictions was a convert I knew in the U.S. Converts tend to be more fanatical about their religion than those who were born into it, and the rules really are complicated, with all their fast days and so on.

As for the connection between actual religious belief, and religion as identity, this is best described by a Jewish joke that I heard in NY. A child in a secular Jewish family comes home and tells her mother about what they learned in school about the Father, Son, and Holy Spirit. The mother gets really upset and tells her girl: "Get one thing clear. There is only ONE God - and we don't believe in him".