I don't know - that's why I'm not the one making an assertion. Evidence for human existence is self-evident, and of itself says nothing about when the concept of God was conceived; so - again - what rationale do you have for your assertion?
Ironically, you're using the right word - 'apparent' beginning. The science of cosmology only tells us it was the start of a period of expansion from a very hot, dense state. It says nothing about where that hot, dense state came from. The consensus of cosmologists is that an actual singularity is probably impossible, but that we have no evidence yet of what there might have been. So strictly speaking, it's the beginning of the
currently describable universe. It's generally described as 'the beginning of the universe' in the same shorthand way as the
observable universe is generally described as 'the universe'; the distinction isn't generally significant unless you're explicitly talking about it.
Ockham's Razor deals with introducing redundant explanatory entities. Positing an eternal and timeless universe (where the big bang is an event) adds no entities to the argument, neither does a temporally closed universe that 'just is' (where the big bang is like a North Pole, with no prior time). There are philosophical arguments against both, but they'd equally apply to an infinite and timeless God concept, and they are the least of its philosophical problems, Ockham's Razor and special pleading apart.
You can think and believe what you like. I was just pointing out that for those who feel the need for it, there are God concepts compatible with our observations of the universe and that make no unsupported claims or assumptions about it.
There's your problem. The question concerns fundamental knowledge about the world - its origins. Thinking outside the box is creative and useful if you know where the edges of the box (of worldly knowledge) are, and you can relate it to, and apply it in, the world; but if it bears no relation to the world, it's less than speculation, it's fantasy - by definition ("
An idea with no basis in reality" -
Oxford Dictionary).