No, I don't. 

I understand that there has been a lot of extraordinary events during ancient times. The Pyramids, the statues in Easter Island, mentions of aliens in ancient texts, all of these point to the possibility that ancient aliens have visited the Earth and influenced our ancestors' way of life. However, rather than contemplate the possibility of ancient aliens, I would rather be awed and astounded by the ingenuity and cleverness of ancient humans. 

I am not saying that I don't believe in aliens. The universe is so vast that they may as well exist. But, I am just a believer in the human capacity. With that said, of all the ancient alien theories, the statues in Easter Island is the one I find most fascinating.