Hello. I will really appreciate your help.

Question

1)which preposition is correct or better in the sentence "oil is a curse of/for the Middle East"
2)is it possible to ommit "that/which" in the sentence "this is a fundamental right 'that (which)' every state must respect"
3)is the article "the" used in the context "Jerusalem is a city sacred to the (?) three religions - Christianity, Judaism, Islam."
THANK YOU VERY MUCH.

Answer 1

1. for

2. yes

3. with or without -- without is smoother, but with is not incorrect.