وَالْإِيمَانُ وَاحِدٌ وَأَهْلُهُ فِي أَصْلِهِ سَوَاءٌ
Faith is one, and believers are alike in its essential foundation.
The core of faith is inner assent. Believers share in this essential reality. The nature of faith should not be confused with every individual act of obedience or disobedience.
Sharing the same foundation does not mean that sincerity, godliness, obedience and moral conduct are equal among all believers.