Good point. 80% Christian in the US, and I'm sure it's bigger in South America.
Although, it is large all over the place, especially southern Africa, Australia, all of Russia (post or pre-communism), and India.
Then again, there are other religions that are big outside the area they are most commonly connected with...
Anyhoo, I guess my answer to your question is, then, Western Ideology, Eastern Medical Philosophy.
As always- None of my statements are evaluated by the FDA.
My advice is not intended to diagnose, treat, cure or prevent any diseases unless prescribed by a health practitioner. All information is provided for educational purposes only and should not replace the advice of your medical doctor.
(but your medical doctor will probably end up killing you