The aliens are not fake, by any means. They physically exist. However the lie is that they are from another planet, solar system, galaxy, etc. They are most definitely not.

They are the Nephilim. Jesus himself prophesied the "return" of the Nephilim as being one of the signs of His Second Coming. They are half fallen angel, half human creatures that are the most hated "creation" in all of God's eyes. There is nothing receiving greater punishment from God.