I actually think it's a both good and bad idea. First, it sucks because so many people will hate it, and think that their religion is being unfavored or given wrong atributes.
But it could give some more nuiance to the game.
Jews - They are often known as great moneymakers. They have a reputation for being very good at finance, and are often bankers or rich merchants. So they should have commercial bonusses.
Christians - They have always been warlike (only in the last 100 years, they have calmed - and some might disagree here too) and expansionistic - so I would give them expansion bonusses.
Islamic people - They are known for their strong faith, so they should have religious bonusses.
Communists/ateists (i'm not saying these are the same, but to make it simpler i put them together) - They should deffinatly have industrial bonusses
Pure Ateists - They should have scientific bonusses due to the fact that no church tries to stop scientific discoveries, because discoveries often tends to make people loose faith, as they see that the church are not the only way to look at the world.
Budism - ?
Hinduism - ?
Anciant greek and roman religions - ?
Anciant north american religions - probably not true very correct, but many see the tribes in north america as warrior like, so I would give them military bonusses.
Taoism - ?
Shintoism - ?
Ancient Egyptian religions - ?
African religions - ?
Are there any others? (sorry if I forgot your religion, but i'm only human, sorry)
Disclaimer: I know, everything I post here is not correct, but my view on things. I don't put different kind of religions into boxes - though I try to give them attributes that I find, they have historical reasons for having. Again I do not say that these are the only attributes that these religions have, nor do I say one is better than the other. EG the Jews. They were known as great bankers, with great influence over the financial world in both America and Germany around second world war, and thats why commercial is their attribute.)