The foundations of Islam and the foundations of faith Fundamentals of Faith No one can be a complete believer unless they believe in the basics of all these beliefs. About Ummer, son of Al-Qaeda, said, "Did a man ask the Messenger of Allah about faith?" He replied: "That faith is that you should believe in Allah, believe in His angels, believe in His Scriptures (which He sent down), believe in His messengers (sent forth), believe in the Hereafter, and believe in the determination of good and evil." (Reporting by Muslims) 5 Principles of Faith There are 6 Principles: