I think, Spud, that the word 'disorder' is your problem: what is your authority for stating this?
Perhaps you'd best check what the current thinking is regarding your terminology, since I suspect you'll struggle to support your view using current professional and peer-reviewed medical research. One key aspect would be to identify whether, if this is indeed a 'disorder', as you say it is, if there are established an accredited treatment options for this 'disorder', as you term it.
If not, then you'd clearly be wrong in your choice of terminology and I'm sure you'd hate to be stuck with out-of-date thinking regarding sexual orientation.
The idea and the authority behind it comes from the idea that men and women were designed by God, with one purpose in mind and everything else is a " disorder"
Because a lot of Christianity sees human beings as having been designed to an ideal by God, everything else falls short, be it pre marital sex or homosexuality.
Many Christians don't worry about being stuck with " out of date" thinking because they see that, as being "part of the world". The moving morality that becomes immoral over time.
They are called not to be a part of that.
Their authority is the bible.
Why some people don't get what they mean is puzzling to me.
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I don't see homosexuality as a disorder, but I do get why a Christian might.
Why should they accept my morality on my say so? Or yours Gordon?