The Greek gods certainly don't fit the description of the incredibly powerful God that created this immensely complex universe. The Greek gods seem limited in their modes of thinking and level of knowledge. It doesn't make logical sense to believe that the creation can become the creator or is the creator. Self-creation is untenable. God must be able to exist outside our time domain.
Some religions proclaim that some or all matter had a beginning at some point in time.
Most do not consider time or space to have had a beginning. Many religions deal with infinite rejuvenation - an infinite time domain universe. I'm not aware of any religion, not including those based on the Bible, whose god is said to have this ability. Some may be able to travel in time but not exist outside of time altogether which is a necessary requirement for the God that exists, who must create a time domain. Some religions have an uncaring or preoccupied god.