How do you think homosexuality became a bad thing?

Greek and Roman culture was not without homophobia. They viewed it slightly differently though, if a man was penetrated it was seen as becoming a woman (they were pretty sexist to) so there was nothing wrong with a man having sex with another man as long he was the penetrator, otherwise his masculinity was questionable. It was acceptable for a teenage boy to be the receiver, because he was not already a man yet, and it was expected that he would go on to be a tough man because of it (quite a contradiction). So while there was more acceptance, there was still many prejudices and stigmas surrounding it. So I think homophobia would still exist without Christianity and some of the ideals we have about everyone being equal began with Christianity so the situation could quite possibly be worse if Christianity had never exisited. The word 'homophobia' itself, who knows, it's obvious that Christianity has had a huge impact on the world, in some ways good and in some ways bad. Maybe if Christians hadn't been so hard on homosexuals then the need to analyze attitudes toward homosexuals would not have arisen and the prejudices of ancient Rome would have gone unquestioned, it's all pointless speculation really, it could have just as easily happened anyway.

To answer your title, it became "bad" because of ignorance and the abrihamic faiths, but because religions grip on society is loosening it is ok.

To answer other parts of your question, a homophobic free world would still have religion but the religions would have the heterosexist parts axed out. Furthermore a world without Christianity, Judaism and Islam would not increase incest, pedophilia (don't ever compare people who are gay to child rapists) because 1) science has proven a child born of incest will be mutated and 2) human empathy controls morality, not the bible or Quran

Because, just like every other sin thew Lord has in the bible mankind always go against. God forbids such a relationship and mankind wants to have their way any way. The bible teaches that we should not steal and kill. How did that become a bad thing? Well, the same with this kind of relationship, it is against the bible and it is sinful!! It's nothing new. The bible has a story about this kind of sin in the old testament. The bible teaches that there's nothing new under the sun. That's one of them. We don't make the law. Whether we exist or not, we did not make the law of the world. God did and the bible teaches that God always was. he has no beginning and no end, so that means there was always laws, because God always was. Now if you say, suppose God didn't exist, wouldn't make much sens because he has no beginning. Besides, if there was no God, there would be no YOU!

Religion made it a bad thing look at the homophobes today they quote religious stuff to justify discrimination against lgbt people

im pretty sure homophobia would still exist without christianity. itd probably start later but it would still be there

Every person have the liberyti tu show yours.feelins

it still just isnt right.

the fact that they eat poop. its sick.