If enough people give enough detaled answers, this could get confusing. Much depends on the local congregation and how they decide to uphold the "rules."
First off, people get called to a judicial committee for some violation of the rules. It is usually only for serious accusations of violations, not for getting a tattoo or telling another member to BLANK off. But some congregations will go after a member for any small rules violations too. There is only one thing you can be "disfellowshipped" for- being unrepentant when they decide your guilt. They can decide that you are only sorry because you were caught or that multiple violations before the committee meets are clear signs that your repentance is not genuine. So typically, you have to kiss their asses and only confess to a one-time violation if that is all they know about.
Gotta run now. I will give more thoughts on your "interfaith" questions later.