God is the Most Great, there is no god but God, none are worthy of worship except God, all praise and glory belongs to God Alone, God is the King and Protector and Lord and Light and Ruler and Creator of the heavens and the earth and everything in them.
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You need to believe in both the Quran and Muhammad as the prophet of God. If you believe the Quran is from God, you must believe that Muhammad was God's prophet and messenger, and you can't believe Muhammad was God's prophet and messenger and not believe that the Quran is from God, that's stupid. Who delivered the revelation of God to mankind, and who fought with his life for it? Prophet Muhammad.
So I'm both a Quranist and a Muhammedian, since I believe and testify that the Quran is from God and that Muhammad is the prophet of God.
The Quran is Truth and Truth Alone, nothing in it is falsehood, nothing. All it says is True and Reality. I put that on everything, and I gamble my entire existence on it, you want to bet and gamble with me? 😉
Read the hadiths or not, even due you should, but to acknowledge and testify that Muhammad was the prophet of God, is the essential important thing, for you will not enter paradise without doing so.
The Quran and prophet Muhammad, both you must believe in and testify to.
This, God Commands. And as God has Commanded, I have testified in the Presence of God, that I am a Muslim, and God is my Witness.
Thus, since I have believed, I pray to God that God forgive me for my sins, and enter me to paradise, and to remove me from the punishment of the hellfire or any other punishment in the hereafter, and God is the Accepter of repentance, and the Answerer to prayers, and He is the Most Forgiving, and He is the Most Merciful.
God is the Most Great, all praise belongs to God Alone.