Why do you fight with the word of God? How in the world are you saying we are limiting God when God HIMSELF told us already that He created ALL life on THIS EARTH (except angels)? We are not limiting Him because God Himself is telling you what He did for His own purpose. He created life on EARTH. NOT EARTHS. You want to ask Him why He created life only on this earth? You'll get that chance for sure when you meet Him, because you and everyone that ever breathed surely will. But until then, we have His words in the bible and what the bible says.

Better question to you is do you have a problem with faith in believing the word of God? Or better yet, on what basis in scripture do you base YOUR conclusions that there is life in other worlds on? Many people here have given you the reason why they believe there isn't, but you have never given any scriptural evidence to support your assumptions?