I have no objection with that approach at a fundamental level in nature. But this comes very close to defining God as nature.
If he set in motion all of the fundamental laws of nature, then many of the derivative things in nature that science observes must then be results of his handiwork. Things (to be discussed outside of this thread) like a very old earth, no Flood of Noah, evolution of species, evidence that the universe was the result of some “big bang” type event, etc.
Hide God under it all, nothing changes. I think He does not exist, your scientist buddies think He does. But in the lab, where we investigate science, side by side I and the believers garner the same results.
And, in line with the OP, either way there is no reason to think other intelligent life forms couldn’t do what nature is unlikely to do in a short time – send a complex intelligent message.