Why? I don't understand.
Occam's razor says to remove any unnecessary features.
So, an all-powerful all-knowing entity created the universe. What does Occam's razor say?
1: The entity doesn't need to be all-powerful, it only needs to be powerful enough to create a universe.
2: It doesn't need to know everything, only how to create a universe.
In addition to this, Occam's razor does *not* dictate that one all-powerful god is more likely that two. Sure two *infinitely powerful* gods are not needed, but then again two entities which are only capable of making half a universe have far fewer possible redundancies that a single all-powerful one.
Multiple semi-powerful entities are no more or less likely to have created the universe according to Occam's razor, it's a false representation; and if we do apply Occam's razor properly we ultimately only need "a thing that can create a universe" and do not need to attribute omnipotence/omniscience/omnipresence/immortality to it at all.