If you believe that God does not exist it does set certain boundaries for logical coherency. It makes much more sense for an atheist to be a physicalist than an idealist.
I don't see how atheism promotes one over the other.
It would make no sense if an atheist believed that human beings have intrinsic worth.
Intrinsic worth can be self determined.
It would not make sense for an atheist to believe that nature has any sort of purpose.
If you mean a sense of purpose other than to continue to live and flourish, possibly.
It wouldn't make sense to believe that consciousness is fundamental.
Perhaps not for a hard atheist, but an agnostic can accept that as a possibility.