Naw, we are completely terrestrial. Same genetics as everything else here. Just another code module chained on to the sequence.
If you don't like the dramatics of our present situation here on the old rock, Idk what to tell you. Don't watch? Idk about day 1, but industrialization forward sure has had a negative impact.
I imagine if aliens arrived here today, we would have a hard time identifying that they were here. They may have a physical form unlike anything we know of.
And yes, religion reeks of "aliens," But not gods. The Akadian people of Mesopotamia. Religion that becomes Sumarian, Babylonian stuff from Iraq. Later looks a lot like the old testament. But a little different.
Check out all of the ancient art with symbols that pertain to genetics and physics. How would they know to use two snakes wrapped around a stick to represent knowledge of health? Like DNA. Snakes, eggs. Lots of mysteries contained. How would you pick these deep symbols randomly?
And...the fucking pyramids. How? Why? What?