Well, when you attach "anti" to a word, it suggests to me that one would be open to attacking that which the party(s) is "anti" or those who believe in what the party(s) is "anti."
If people want to believe in a Deity, again, I say that they should be free to believe in that Diety. I don't know a lot about communism but if religion is not allowed in communism I wouldn't subscribe to communism.
Peace.
There is a lot of difference between anti-theism and government-backed repression of religion, because:
1. Religion and theism are very different things.
2. Anti-theism is not, and shall never be, backed by governments but rather by individuals.
3. Forbidding religion is pointless anyway. People will hold whatever beliefs they feel like holding.
People should indeed feel free to believe in deities. They should not expect everyone else to find that a good idea, though.
I don't know a lot about communism either. Maybe it is anti-theistic. I wouldn't know.