Originally I was not going to reply to this thread. However, after reading some of the responses, I feel I should give my view point.
1. Earth was the only planet created to support life.
As mentioned previously, earth is the only planet discovered with the right combination of resources to support life.
2. We currently have no evidence of alien life forms.
Many organizations have been scanning the heavens for years without discovering extraterrestrial life, and without detecting any radio signals from aliens. Since no one has discovered extraterrestrial life, secular scientists must ask the question: "Where is everybody?"
3. The nonexistence of extraterrestrial life disproves evolution.
If the billions of planets in our galaxy were all accidents, than it is almost inevitable that some of these planets would of had the right conditions for life to evolve. (Ghoti and Eddie alluded to this) However, if these planets are billions of years older than earth, according to evolutionists, there should be millions of technologically superior civilizations. Yet, we have found no such civilizations. This proves that evolution is a false concept.
I am very disappointing at how misinformation is widely taught and accepted in our society. For example, I was taught in my college geology class that the earth is 4.5 billion years old.
4. The earth is about 6,000 years old.
Scientific evidence points to a young earth, so theories such as the day-age theory are completely unnecessary and false. The Hebrew word for day is yom. Every time the word yom is used, it refers to one literal day. Couple this with the fact that the word yom is used in context with the words evening and morning, it becomes very clear that creation took six literal days.
5. Humans were much more mentally capable thousands of years ago than they are today.
This concept helps explain how architectural feats such as the pyramids were possible. (Panamoka_Bassin was right on about this)
So no, I do not believe in "E.T."