Is it illegal to say that homosexuality is a sin?

No, it's not illegal to say that anywhere. It is, however, just an opinion, and to try to force that opinion into law or use it to persecute gay people is ethically wrong.

No, it's not illegal to say that anywhere. It is, however, just an opinion, and to try to force that opinion into law or use it to persecute gay people is ethically wrong.