Brilliance in one endeavor doesn't necessarily translate into every endeavor, especially one taken on in such a cursory and ad hoc fashion.
Or as Heinlein pointed out “expertise in one narrow area doesn't translate into other areas, and yet the narrower the area of expertise, the more likely the expert is to think that it does.”
Devining what Einstein thought after his death is similar to “reading” chicken entrails or tea leaves. Like most mortals, I’m sure he believed different things at different times. Again, may God bless him, but what difference does it make what he believed? He was a scientist who rejected belief as a methodology for establishing truth.
Tell it to the Rev. Dr. John Polkinghorne....