We are told by many New Atheist scientists in particular (who like to mark their territory, but, fortunately in a way slightly different than, say, cats) that a belief can only be scientific if it is falsifiable. This is their demarcation criterion of choice and they use it to ruthlessly guard the borders of science. This is one of the reasons, they say, we must reject Intelligent Design. This idea comes generally from Karl Popper, a philosopher, who said that a theory cannot be considered scientific merely because it admits of possible verification, but only if it admits of possible falsification.
It is this general idea that is behind Richard Dawkin's "Flying Spaghetti Monster." The Flying Spaghetti Monster, says Dawkins, exists just outside the range of the most powerful telescopes and the more powerful the telescopes, the further away the monster gets so that we are never able to actually detect him. There is therefore, no way in which belief in him may be disproven.
Okay, now take the belief that life exists somewhere else in the universe. This is a common belief among atheist scientists. In fact, Dawkin's himself conjectured that life on earth may have come from other planets. But how can that belief possibly be falsified?
There is a possibility that, if true, it can be proven true simply by finding it somewhere in our outside our own solar system. But if it is false, how could we ever know that it was false? If it was false and the universe were infinite, as many scientists believe, then would could never know it to be false even theoretically. And if it was false but the universe was finite, there is no practical way we could ever know it to be false even though it is theoretically possible--although there is some question whether it is even theoretically possible for humans to investigate a universe as massive as we know ours to be.
Even in this latter case of a finite universe theism would be less problematic since a theist could simply say "Well, we will find out after we die." And since everyone will certainly die, at least he has that to go on.
So there you have it. Belief in extra-terrestrial life. The Flying Spaghetti Monster. Theoretically indistinguishable. And taking this into consideration, how is believing in God any more or less scientific that believing there is life on other planets?
Let's see what the Peanut Gallery has to say about this one.