The races here on earth all descended from one original pair of human beings, Adam and Eve. Battlestara Gallactia aside, there is no record of any other extra-terrestrial race of human beings.
Because of their sin, all creation, the entire cosmos, was subject to futility.
19 For the earnest expectation of the creation eagerly waits for the revealing of the sons of God.Extra-terrestrials is the stuff of science fiction, not true science nor theology.
20 For the creation was subjected to futility, not willingly, but because of Him who subjected it in hope;
21 because the creation itself also will be delivered from the bondage of corruption into the glorious liberty of the children of God.
22 For we know that the whole creation groans and labors with birth pangs together until now. (Roman. 8)
There is a lot more evidence in favor of the existance of ETs than there is for the Biblical model. You folks are putting God into a box that YOU can understand, not one that GOD can understand.