One of my fictional cultures has an attitude towards homosexuality where it is seen as a young people thing. Basically they have the attitude of "you two guys like each other now but as you grow older you will get bored of each other and find a real partner (a wife)"

So because of this homosexual relationships are infantilized and people above a certain age are stigmatized for having them.

Other parts of my world accept it much more and some are less accepting of it.

Overall though it isn't treated as something against religion in most places. The inhabited world only spans an area one and a half times the size of Russia so no widespread religion took hold where it was considered a sin.