Humanism is born out of the greediness and mishaps of the church in organizing the religion based on their own way of understanding, thus making the term "Organized Religion" to become relevant. Religions are perfectly organized but it is their devotees that astray from the right path and made their own enactments thus dragging religion into play and made the religion deviated from its divine structure.
Humanism emerge to surface because of people want to escape from the prison of thoughts set up by the church and unlock their mind to think freely without restriction thus unleashing the power of mind to dictate the whole body. The question is why create a religion that promotes freedom without structured things and regulated points while they themselves are living in an indirectly organized life? The existence of rules and regulations are simply meant to organize lives and to shape the attributes of people in order to become a disciplined man yet why they suddenly bowed amend to that? This is blatant irony and crystal clear contradictory.
Religions are well organized. It's the rigidity and the misguidance of their priests who turned them otherwise. Islam is syumul but there's always a fine border between what's right and what's wrong. What's enlightening and what's deluded. What's awareness and what's ignorance.