I think all lifestyle "choices" we make are hard to shift, some of them because they're addictive (bio-)chemically, others because we have a lot invested in them emotionally, spiritually or whatever. Mostly, we are where we are because of accidents of birth, development, key events, and (maybe) genetics. My question about people making radical "faith" choices is a serious one. Many people will talk of an "epiphany" moment in their lives when they "found" or "lost" faith, and that's often even harder to walk away from.