Hi Denial - yes - totally.
God is not human for sure - though many spirits take forms that are accessible to us so that we can interact. However god is just like most spirits (but different lol) - god can be contacted by the same methods - primarily clairvoyancy.

The big bang, and stangely the description of the creation in exodus go together well - the main discrepancy is about the use of the word days - insert instead perioads (some of which may be billions of years long) and then it fits together reasonably.
Where god came from will probably not be answerable without much more knowledge about where we came from - we can peel the onion ok knowledge one skin at a time.
Yes - scale is a major issue.

love
chris