There's definitely a God...

Here again 'thicker' is meaningless unless you tell us what you mean by it.

Not only do I think people were less intelligent, I suspect they were even less conscious than we are today.

If you think of intelligence as one form of adaptation to the environment, then in circumstances in which we know that there are wildly different environmental pressures, what counts as intelligent in one will be different from what counts as intelligent in the other.