Underlying this statement is an unsupported assumption that life just spontaneously generates and this has never been shown in any scientific study. Besides, that is mere speculation - how do you know that there are rocky planets outside our solar system, and how do you know that they would contain microbes under the crust? This is all pie in the sky stuff you are talking about.
Over 100 extrasolar planets have already been discovered. As to small, rocky planets, 2 or 3 telescopes designed to detect earthsize extrasolar planets sould be in operation around the end of the decade. We'll see, and this is what we expect to see. If we see something else, then fine, we'll have plenty of new work for young astrophysicists and exobiologists.
These aren't religion questions. Different ballgame.