Is it possible that both GOD and universe existed forever?
Is it possible GOD existed forever but the universe came into existence through natural means?
Is it possible that GOD existed forever but may someday not exist?
Is it possible that GOD is some as of yet not understood aspect of the universe?
Does it matter?
If GOD exists then GOD exists regardless of any evidence that She does not exist.
If GOD does not exist then It does not exist regardless of any evidence He does exist.
Aslan is not a Tame Lion