Seeing how a lot of the old testament is shared by Christians, Jews and Muslims, I'd think it's highly likely that a good percentage of religions are against acts of homosexuality to some extent. But I also feel it's how members of said religions and even denominations/sects themselves choose to interpret the wording.
But I feel that though religion may have a great influence as quite often religion and culture seem closely intertwined despite what people want to believe, the biggest thing is what the society in question sees as acceptable. This view would be influenced by such things as cultural customs, religious customs, previous ideas held by the collective group and possibly observation of the effects living a certain way can have on the collective (but bare in mind these could be quite outdated if the times have changed that much that they might no longer apply).
Christianity may get singled out moreso than other groups as a good percentage of the world are Christian, hell a good percentage are devotees of Catholicism on it's own. I think as of the last chart I saw a year or four back, Catholicism sat at around 20% of the global population while Christianity (including Catholicism) was around 35%.
But when it comes down to it, once upon a time there was a need to recreate heaps to create vast numbers of meatshields to throw at the other meatshields of neighbouring communities. These days many of the meatshields are educated well enough to know that fighting is their choice as well as the consequences of their actions as the enemy might not be as evil as it was once portrayed. Perceptions do kind of get flipped on their head with the aid of global media. Propaganda loses a ton of it's power. And now that the global population is growing as it is, and there is much less retarded fighting over resources or an inch of extra country border, people really don't have to be in a reproducing relationship so much. That to me was the cultural or practical side to it, religious interpretation does seem to be the biggest current factor (and probably the previous biggest factor regardless of practicality) in interpretations of what is right or wrong.
I'm a Christian btw, just thought it'd be interesting to get those ideas out, especially as I did Studies of Religion (a general course showing aspects of several religions) solely out of interest. And I don't get why people can't just stay cool. Not like homosexuals are trying to convert Christians to homosexuality or something.
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