Peace be upon ye
Is the creed of Islam among quranist is ashadu AnnLar illaha illallah? How many times prayer you about your day? If you say almost the same in prayer, as one does in Sunni Islam?
Possibility you will get confused if you ask questions like this.
There are many theories about ritual and if you read them all, I believe you will ask common questions like "Which one I must follow", "Which one is from God".
I seen many Quranites leave Islam cause unclearness within this issue.
Personally I'm also confused with too many salat,hajj, fasting theories in here.
Islam is easy believe in God and Judgement (262) and good deed (2177).
If you in doubt, just ask Him by praying, meditation or other ways to ask Him to teach His knowledge to us.