The whole point of evolution is that it shows ho you get complex life without invoking a god or anything supernatural
As for abiogenesis there isnt a set theory yet (as far as im aware) but the theory of a god behind it isnt going to help the investigation since you put forth and answer to the question that cant be falsified or tested for in any way. It would be no different than me saying life began because of a batman/unicorn monster. There is also not a shred of evidence for it, hence why it comes down to personal beliefs
If we go to the big bang, no we dont know the ins and outs of how it began at the very very begining or what came before but once again, saying "god did it" or "i think god did it" doesnt solve anything and doesnt actually explain anything at all. There is however some scientific ideas about the "pre-universe" via brane cosmology
Life evolved without an agent, no reason why the univese needs and agent in order to function and produce things or have an angent to begin it
I dont mind the whole deist philosophical arguments but not the theists and deists who try to push their beliefs into science
Its interesting that ID has never produced any evidence for its bold claims other than "this is the only way i think it can be"
Unbowed, Unbent, Unbroken