Do you understand that scientists also observe nature and explain it without invoking a God.
And do you also understand that nature is entirely consistent with there being no God?
And do you therefore understand that nature is not evidence for God.
It's like saying that it is theoretically possible that someone deliberately planted weeds in my garden.
The weeds are there.
So the phantom weed planter must exist!.
The presence of weeds is consistent with His existence, but it's certainly not proof of it and, given that there are other more plausible explanations, it hardly counts as evidence for it.
So, while nature is tangible, it's not evidence.