>>512904224
it distorts the definition and purpose of marriage. And when enough people and external influences distort its purpose and make people forget what it's supposed to solve, it loses its value and the problems it solved end up seeping back up into the surface.
More importantly, Christianity has revolutionized and powered society as we've known it for 2000-8 years. This " why should you care if it doesn't affect you" implies you have the foresight to detect if something will personally affect you, whether now or in a generation or in 2 generations. Christianity has gone through centuries of figuring out what lifestyles work and what don't. Perhaps you should have a little more humility and figure out why Christianity banned X over saying "don't give me a religious answer!"