"Jesus would rather kill, not marry, gay people" - Franklin Graham

[Brian37]

Yet, it is reasoned and therefore insulates against the charge of "bigot".

Nope it insane and wrong 

 A person may still be a bigot, but it is not entailed from the belief itself.

But in this case you are a bigot and it is because of a belief system .You are a ideological bigot for trying to justify your bigotry through an ideological lens .

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Your problem is you base your life on an old book of mythology written in the authoritarian age of kings. None of the morality of antiquity reflects our modern west.

Indeed the KKK opposing interracial marriage is ideological bigotry

Muslims throwing gay people off buildings is ideological bigotry 

In Africa Christians treating animists as second class citizens by a weird interpretation of the bible is ideological bigotry

The Mormons saying  a black man can only get into heaven as a slave is ideological bigotry 

And lastly using the bible to condemn gays and deny there relationships equality IS ideological bigotry 

Doctrines can be as bigoted as people and if god were real then he's a bigot and immortality and creation do not goodness  make.

I like to be fair in this. This isn't just about Christianity, but worldwide in antiquity. Ruling families ruled worldwide back then, so it isn't just Christianity, but even Buddhism and Hinduism, not just the 3 religions of Abraham.

Even the ancient Greeks and Romans, we falsely call them the seat of modern democracy, but that would be false. Even they had ruling families and slaves. And while they had senates, they still really had no western veto power or impeachment power or "no confidence vote". The only thing that could be argued about the Ancient Greeks and Romans would have to be a case by case individual king, which is what a Caesar is, some could be argued depending on name, to be more tolerant or less tolerant. 

Humans worldwide back then falsely assumed that a tribe/nation's success was from the hand of a god or gods or ancestor worship.

"Divine right" was the global belief in every religion, that your ruling and or success was coming from a super natural place.