> 2. "US outright ban any casual religious reference because it offend some believers, resulting modifying some manga/anime/game" -- Can you give an example? This seems to go directly against first amendment rights.

I also would love to see some example and an not aware of cases were stuff was changed due to laws. There is self-censorship, as e.g. the Spice and Wolf anime trying very hard not to use christian symbols for the religion obviously modeled after Christianity. This kinda makes the target audience kinda look bad, but that's their choice and totally fine.