Answer

This is a serious malady: people dismiss an entire group of arguments with an a priori claim, just by declaration. If there is a good argument—meaning, you examined it on its own merits and did not find a refutation of it—then that itself is proof that it is possible to prove the existence of God, meaning that your a priori reasoning is incorrect. Therefore, one should examine arguments on their own merits, not through general, a priori declarations.