y’all didn’t learn any history about the bible or historical religious texts and it shows.
christian or not, religious or not, the bible is one of the most irrefutable pieces of historical evidence we have. period. the religious things and callings you can leave out if you aren’t christian, that’s fine. but jesus was 100% a person and what he said is difficult if not impossible to argue existence over. doesn’t mean you have to believe in what he claimed, but he existed. and that’s just history.
you didn’t expect the complete denial of religion for oneself being a sin of following a religion??? the whole point of following a religion is following that religion. not following it is in large part a sin. of course there are exceptions, but if we are speaking about judaic religions (the most common use of the word sin), literally not following the religion is a sin.