I have always found the issue of homosexuality in Christianity a difficult one. Mainly because I can’t see anything wrong with loving gay relationships.
However, as society has moved from seeing gay relationships as harmless to seeing them as identical to heterosexual relationships in every way, we are now seeing harm. Because once gay marriage is ‘identical’ so everything in marriage is opened to same sex couples, such as adoption and surrogacy. Children need parents of both sexes to raise them. Whether you believe in creation or evolution it is clear that children as they grow older they start to gravitate more and more to the parent of the same sex as them ( this starts from about age 7) as they learn to base their understanding of their own impending womanhood or manhood on their parent of the same sex. Girls will unconsciously model their own expectations of a partner on their Father and their parents’s relationship, and ditto boys but on their Mothers. Children benefit most from parents of both sexes.
Yes there are bad heterosexual relationships, just as there are bad same sex ones, but in a comparison of an ideal heterosexual relationship and an ideal homosexual one, the same sex relationship can never be as good for children as a heterosexual relationship. This is nothing to do with the quality or value of the same sex relationship, nor is it about the quality of their behaviour as parents, it’s simply that the sex of both parents means that aren’t able to meet the innate needs of children,
I do not agree with surrogacy for any couples, or individuals, regardless of sexuality. Deliberately creating a child not to know one or both parents is harmful and wrong, using women’s bodies is wrong. Gay spouses have the added harm of a child been denied either a mother of Father. I think it is especially harmful where a same sex couple raise a child of the opposite sex to them. That poor child is denied that intimate role model and connection with a same sex parent.
So I used to be very in favour of same sex marriage. But as I’ve lived more, had children and bothered to learn about children’s developmental needs and seen that evidenced in my old children, I have realised that the Christians who raised objections to gay marriage and foretold where it would lead were right and I was wrong. I apologise to them. And the Bible was right about the central importance of marriage being between a man and a woman.
( ps. Yes you get single parent through bereavement or abandonment doing a fantastic job in difficult circumstances. But again that is not an ideal situation and not one we as a society should seek to artificially create).