No, and most people who are called 'anti-theists' aren't against every single religion. Hell not even every single religion is theistic. But when people say 'anti-theistic' what they usually really mean is anti-Christian. And Christianity does have that history.
Preeettty much. If you have a million page views and you're a sell out, making money off commissions that are just flooding your inbox, people aren't going to give you crap. You can say anything and get away with it. But God forbid you're not as well known and you say the wrong thing. Come to think of it, that's just the Internet in general. Not just Deviantart.