An easy answer to this is "that's why He's God, and we're not," but that's kind of a cop out, if you ask me. To me, what you just stated is what makes God's love for us so special--there is nothing we can give Him that He needs, there is no way to thank Him enough for every breath we take, and He knew this before He started creating anything, and gave us life (and His Son) anyway.
Look, I'm not gonna sit here and try to make you believe what I believe or anything--believing in God/following God/whatever you wanna call it is a personal decision. All I can do is explain what I believe is true to you to the best of my abilities, and you can take it for what it's worth.