The only forms of life that we scientifically acknowledge to be life are carbon-based. We know many of the rules and limitations pertaining to carbon-based life. This form of life cannot spontaneously arise from nothing.
We attempt to assert this rule for carbon-based life onto all other potential kinds of life when we suggest that God must have come from somewhere in order to be alive. To impose such constraint on other kinds of life would be an example of extreme bias, and is unreasonable in the extreme.
We further complicate matters by suggesting that carbon-based life must have come from nothing, because we are here; assuming that abiogenesis (1) must have occurred on earth or (2) might as well have occurred on earth, because it either occurred on our planet with its environmental contraints or on some other planet with different constraints.
Why can science not admit that there may well be intelligent life that is not carbon-based; i.e. life that is not limited to the rules governing carbon-based life?
Respectfully,
AuldSoul