Why God can't be just a powerful alien being according to Hinduism?
http://www.hinduisminfo.com/2010/02/god-alien-race-hinduism-ufo.html

The idea of the notion of God as a very adva alien race(s) is very popular one. If you haven't heard of it before, it combines Abrahamic mythology with science that explains why God exists scientifically! Basically, there are two "branches" of the God as Alien theory -
1) That hundreds of thousands of years ago, a highly advanced race of aliens descended on earth and started life or genetically modified apes into Homo Sapiens for unknown reasons. They kept visiting the Earth every once in a while and the early humans, who couldn't understand them, started refering to them as gods.....Then over time, the idea of God evolved into so many religions that we see today.
2) That life had already begun on Earth but the humans had evolved very close to the Homo Sapien stage when the aliens arrived. These aliens decided to either help the early humans for various reasons or use them for manual labor and taught us technology and language. These aliens created mysterious strutures like Nazca lines and Stonehenge etc as well. Early humans, again, couldn't understand them and decided to worship them as gods. Then at some point the aliens left and over time the world forgot about them and it all became folklore finally transformed into religion.
Now both of these theories are very similar in nature and explain stories in Bible, Quran and many other ancient texts. The first theory explains things like creation of Adam from mud and creation of Eve from just a rib (genetic engineering maybe?). They explain the mysterious structures all over the world that early humans simply couldn't create on their own! They explain why Homo Sapiens had such abrupt explosion of technology that made us the dominant species on the planet. Even the stories in Greek mythology like Poseidon bringing Fire (technology may be?) to humans and Hindu stories of fallen gods roaming the planet!
A thoughtful reader of my blog asked me (in the comments in my post explaining the nature of Shiva) if this applies to Hinduism as well and I was intrigued to analyze the Hindu definition of God and try to match it with the God as Alien being theory. At first it seemed as if this alien being theory explains even Hindu notion of God but I realized that it is not so - God in Hinduism can't be an scientifically advanced alien or some other otherwise super powered being. Why?

Now let's see how the Hindu notion of God fares - In Hinduism, the supreme entity is Braham that manifests itself in this Universe and more. Braham is the sum total of the universe and more! He manifests Himself into Prakriti and Purush and Maya and that is seen as this world by our senses. How is it different from the God in Christianity/Islam? Because, according to this theory, Braham is all pervasive and everything is just one. The world looks what it looks like simply because thats how our senses see it but if someone suddenly god the Divya Drishti (the "sight" that

I hope I explained why God in Hinduism can't be seen as an advanced alien civilization in this post! Till the next post, au revoir!
then one must assume that there can be no Hell,
because if Braham is all, then how can God put any part of Himself in Hell. or how can Hell be any part of God?
If there is any scope of ancient alien theory i think it is in egytp and sumeria.
If there is any scope of ancient alien theory i think it is in egytp and sumeria.
Type "hindu cosmology" in google and you could learn more