This movie, as im sure previously mentioned is about relationships and love, not about homosexuality.
The same movie would work if the story was in the deep south, early 1960s where a black man fell in lvoe with a white woman, or vice versa, and the pain and suffering they would go through.
But anyway...
To think that there would not be homophobia if there was no religion is very simple and untrue. People ''other'' people all the time.
The only way for certain hetrosexuals to feel normal is if they ''other'' people who are not like them.
''So gays are bad, and horrible people, and because i am not gay, i am ok'' is the attitude.
Besides, word hetrosexuality was only invented after homosexuality. People couldn't handle not having to compare homosexuality with something ''normal''