Descartes/Meditation Part 1

"Be that as it may, there is fixed in my mind a certain opinion of long standing, namely that there exists a God who is able to do anything and by whom, such as I am, have been created. How do I know that he did not bring it about that there is no earth at all, heavens, no extended thing, no shape, no size, no place, and yet bringing about it about all these things to appear to me exist precisely as they appear now?"

Another quote that I wanted bring up, from Meditations, Descartes in the place of describing doubt, questions the existence of God, where do the heavens, the earth. and everything that makes existence, where does it all come, and how does he know that it all came from God. This question myself, I pondered, like what was before God, and what made God just appear and create everything. This is questioning, is what Descartes points out in order to have reason you have to doubt everything, you have to ask how does everything come into existence. However, I believe in my opinion there is a reason for God's existence, the earth, heavens and all other natural things that exist, but why is there still doubt today about God's existence?