I agree but i don't think the argument depends on whether God exists or not. Let's put that aside. There is simply no rational ground for treating relationships between two people of the same sex as marriage. We are by nature, by our deepest biology, a sexually reproducing species which depends on the sexes coming together in sexual union, the one and only kind of sex that is capable of producing new life. The offspring of that conjugal union go through a very long period of maturation during which both young and their mother need to be protected and provided for by the father. That is why all the early legal codes, even from millennia ago, were primarily about fatherhood, instituting marriage as a way of institutionalizing fatherhood as a legal, social, moral obligation enforceable in law. It's why in all societies, including those that were most "gay-friendly" - i.e., most supportive and appreciative of gay (including man-boy) relationships - never confused those relationships or that kind of sexual activity with marriage. The new state-enforced orthodoxy detaches the institution of marriage from its nature and purpose - delinking sex from procreation, children from their natural parents - and reduces marriage to a kind of state-registered friendship. Even worse is the tyrannical way media, courts, schools, and elites generally seek to impose this new dogma on society and stamp out free speech and, yes, freedom of religion also.
