Archaeologist please form analysis and argument.
You really need to ask yourself why you have such trouble believing the pyramids were built by human ancient egyptians. Thats the real weakness in the ancient aliens claim.
Never stated the pyramids were not built by humans. Their exists megaliths all over the world. And if you look at the evidence objectivly, there exist some amazing facts... Why is it so hard to believe that Alien life might exist. I do not know an Astromer who does not believe in the possibility. This is why SETI was created.
I think the egyptian time line is off. I think humans did build the pyramids like the ones in China, Bosnea, South America, Mexico,... they are all related. The Sumerians built the first step pyramids as far as we know. They greatly advanced civilization with giving 100 firsts to humanity, schools, law, writing, math, bricks, beer, ect...
Judaism stems from sumerian cosmology. Humans are the workforce, the labor, but their ingenuity, where did it come from. How is it they were able to build these Great Monoliths all over the world with precission. They did things that we cannot reproduce to this day.
The argument is not about alien vrs human, the argument is how. How did they do it?
There exist major cities under the ocean, with the latest one discovered off India's west coast.
We are still searching for the facts, and we should not discount any valid theories that explain possiblities. Alien pressence on the Earth is a valid theory that is supported as a possibility by many Scientific Fields.
We know Giants have existed. How many people believe in Giants?