If you could go back in time and make the entire Middle East a Christian-majority region, would you do so?

Yes  because thats  what is was  before Mohammed was born  jew/ Christian Mohammed was born  600 years  after the death of Christ

The 'entire' Middle East was never a wholly Christian area. For less than 200 years there were several Christian areas in crusading times, but those areas had also many Jews and Muslims, on whom Christians depended for food etc.

If you look at 200 years compared with, say 5,000 years, that is not a long time.

Hell no.  The middle east has always been in one form of turmoil or another, regardless of the religion of the month.  

Seriously, that part of the world has never known peace.

If I could go back in time I would go back to the garden of Eden. And I would dress myself up in a really scary demon costume. And I'd wait by that forbidden tree hiding in the bushes and I would wait till Eve got deceived. And was just about to eat that forbidden fruit and I would jump out scare the living crap out of her and stick her in the butt where's my electronic stun pitchfork. Of course my ACT would change all of human history me and you might never be born we may also be born but into a beautiful paradise Earth instead of the crap hole that were in now but I'd take that chance

i might do that

No, western religions are awful. I would make it Buddhist.

Ironically, the same Westerners who complain about Islamic fundamentalism 24/7 were the ones who orchestrated its rise. The West supported the savage sheikhs of the Gulf states over secular nationalists like Nasser. They funded the mujahideen in Afghanistan against the Soviet Union. And today, they support al-Qaeda in Syria.