I am not Muslim, but I recall Baraka’s use of the lower-case "islam" to signify non-formal "surrender" to the divine e.g. as an internal subjective experience every being experiences. (Kid Khalila on sledding: "I don’t try to steer, I just ride along and usually it turns out all right.")

Heresy isn’t always liberation, but liberation is always heresy. Pharaoh calls islam shirk.

The point is unity in diversity, not homogeneity in the guise of the Supreme.