ANSWER:
If you are in doubt about your religion and you don’t have certainty, you my friend are in a big problem!
How can you prove to someone in the middle of the day that the sun is in the sky if he doesn’t want to admit it?
All what is in this universe directs you to the oneness of Allah, though there are many who don’t believe in His existence or who associate with Him other gods!
Does this mean they are right?
If you don’t believe with certainty that Allah is One and that His messenger is Mohammad salla Allahu alaihi wa sallam and that the Quran is His word and final revelation, with such doubt, you can’t be Muslim!
I would recommend that you book a counseling session with me if you can afford it to remove such doubts from your head before it is too late, if it is not already too late!