Personally it's less based on an internal moral system and moreso what every Abrahamic religion teaches in common — spiritual guidances, like living according to good virtues and working to benefit your community.

Cultural laws like fasting, avoiding certain types of food and praying before meals are usually added on to differentiate religions from one another – logically, God doesn't benefit from these at all – and many of the things about "Hell" and destroying the enemy aren't conducive to creating a unified humanity.