system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do religious Christians care so much about the legality of gay marriage, but not about the legality of cheating on your spouse?
gpt
Two reasons:

1. You're making a false comparison by comparing the *criminalization* of adultery against the *subsidization* of marriage.  Gay marriage being illegal doesn't mean you go to jail for it - it just means that you can't file paperwork with the government.  In contrast, adultery being illegal means they put you in jail for committing adultery.  In any case, adultery does have legal consequences in many family courts.

2. People aren't challenging Christian doctrine with regards to adultery.  People overwhelmingly view adultery as morally wrong and only a few people on the margins are arguing that adultery is just fine.  In contrast, proponents of gay marriage *are* challenging Christian doctrine by arguing that homosexuality is not a sin.