What is Deen?

There is no bad religion, only bad people!

There is no debate between us and you (about your religion, ritual or god, but about your worldviews). (Q42:15)

It has been said that the word Dīn appears in as many as 79 verses in the Qur'an, but because there is no exact English translation of the term, its precise definition has been the subject of some misunderstanding and disagreement. For instance, the term is often translated in parts of the Qur'an as "religion". However, in the Qur'an itself, the act of submission to God is always referred to as Dīn rather than as Madhhab (مذهب), which is the Arabic word for "religion"; Wikipedia