Theologians speak of Creation, or an act of creation, which starts up the universe. It is God's fiat: Let there be Light! This act of creation is now.
Both of these descriptions of beginning are mythical insofar as they refer to 'time past' as the point of inception for this universe. The only beginning that is non-mythical is this moment---this moment is the beginning of what is before, behind, above, below.
This is a crucial lesson to learn---one must develop the habit of thoughtstopping as soon as the mind tends toward the PAST as the origin of the here and now. Then one can see the mind painting myth.
