No doubt it is true that science cannot study God but it hardly follows that God had to keep a safe distance from everything that scientists want to study.
Science by itself has no moral dimension. But it does seek to establish truth. And upon this truth morality can be built.
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The assumption that nature is all there is and that nature has been governed by the same rules at all times and places makes it possible for natural science to be confident that it can explain such things as how life began.