What I find even more reprehensible than the sentiment “Without the threat of consequences, why should I be decent?” is that their own fucking book holds the answer to their goddamn question (not an expletive here, their god should and probably would damn them for it):
“So in everything, do to others what you would have them do to you, for this sums up the Law and the Prophets.” - Matthew 7:12
The first half of this is a principle independent of religion, a fundamental social contract, the most critical idea underpinning any functioning society: Expect your behaviour to be reciprocated, and act accordingly. If you want others to help you if you need it, help people (if you can). If you want others to be kind to you, be kind to others. If you’re gonna be a prick, expect others to be just as prickly to you.
If all that keeps you from murdering people is the threat of eternal damnation, you forget that your own scripture says “If you kill people, expect that others may kill you in turn.”
Bonus: the biblical Jesus was known to hate hypocrites that pick out one piece of scripture to follow and ignore another and pharisees that carefully interpret and follow the letter of the law to find loopholes and ignore the heart of it. Those people lawyering their way around the otherwise unmistakable passages about generosity and giving away your wealth? Believe it or not, straight to hell.
More disgusting than the sentiment mentioned at the start is the hypocrisy of selectively applying it, the inconsistency in their own beliefs, the hollow facade of devotion while spitting on the principles they perjure to obey.
Signed, an apostate whose faith was shattered by fallacy of preaching love while children suffer and threatening hell while blasphemers thrive.