The reason taking blood grosses us out more than it does the general public is not because of our former scriptural beliefs.
It is because the Borg spent 100+ years lying about the medical risks and making it seem horrifying and disgusting. Those things have *nothing* to do with the scriptural teachings. They knew their scriptural reasoning was weak, so they supplemented it by fearmongering, misquoting medical professionals, and lying.
Those who weren't in the cult during the worst of the fearmongering are still affected. There is something like a race memory among the Borg collective--discuss blood transfusions and they feel nausea. They don't have that sensation when they see someone wearing a cross or hear people talking about Xmas decorations. It's not the scripture that causes the nausea!
Just make your medical decisions based upon medical facts, not upon emotion, and you'll be fine.
I don't think anyone is "pro-transfusion". It's just that most of the universe recognizes it is necessary sometimes.
I've had transfusions of whole blood and fractions. I don't like it and I've refused it too many times, at great personal risk. The refusals were because of my prior brainwashing, not because my decision was evidence-based. I try not to do that anymore. When I need it, I take it. I'm not gonna die foolishly.