To believe in something without evidence is unnecessary. To restrict your life from many of the world's pleasures and base your behavior as well as your treatment of others on said belief, is insane and idiotic.
I know, that's what I meant. To believe in god does not make you insane or idiotic. It just isn't necessary, in my opinion. Just when you do the things I listed before because of your faith in god, makes you insane and idiotic.
When I say religion is an inadequate moral justification, I mean when people condemn arbitrary behavior or say they oppose a particular social behavior (e.G. Abortion) and use their religious beliefs to back it up, that's not good enough.
Assuming you mean the Christian God here. Is it really expected for people to believe something some old book tells them? How cult like is that? "Hey man check out this book! :) It tells you when it's okay to murder and rape and own people! It's really cool!" Yeah, no. Thank you but your particular taste of girl scout cookies sickens me. I prefer the double chocolate with a side of reality kind.
Yes. But, I believe most if not all religions' idea of God is mostly false or false completely and they would not recognize God if God was visible in front of their faces nor do we completely know the nature of God. The only correct aspect of theists is that there is a higher being beyond ourselves. God is neither male or female. God is not some bearded old man in the sky nor is the entity a spaghetti monster or a human that walked among us. Our very existence and the universe/multiverse is evidence enough. God possibly does not participate or participates rarely in the physical realm.