Why do some people have a hard time believing homosexual people are born homosexual?

I’m not sure about all but I suspect a lot of these people are probably religious.

Religions say homosexuality is a sin and many religious people believe something has to be a choice to be considered a sin.

If you say somebody is born a certain way you are basically saying they didn’t have a choice.

Why do some people have a hard time believing homosexual people are born homosexual?
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