All the more reason not to trust the person... if the fact that
someone is a "born-aginner" even has to be mentioned, then there must be something less-than-honest/honorable that
said supposedly-clean-living person has to hide --- "methinks he doth protest
too much"!
I have seldom if ever had any more luck with the honesty/integrity/consistency/reliability/kindness of someone about whom I was solemnly assured that, "I'm/he's/she's a Christian, so you can trust me/him/her"... in fact, if anything, these stuck-up Bible-thunpers often seem to be even BIGGER a**h**es than their "non-believer" counterparts! They think that "
God will forgive them" for anything they do, and so they make little
true effort to keep their word or otherwise treat their fellow
humans with even basic decency.