I agree with you that these scientific explanations do not have God hardwired into them, so the possibilty that God did
not do it, does exist.
This, however, does not mean that God doesn't exist.
This is only
one of the possibilities.
"The good Christian should beware the mathematician and all those who make empty prophecies. The danger already exists that the mathematicians have made a covenant with the devil to darken the spirit and to confine man in the bonds of hell." - St. Augustine