I think your issue is that you lack an understanding of Islam and just lumped it in with other religions (your judaism comment), yeah it is idealistic and spiritual and the belief of a god who controls everything contradicts materialist dialect, but it's not the only thing in Islam, it is not only worship and beliefs, there are also guides in it, Islam doesn't say "pray and the enemy will die" it calls for fighting against the oppressor which is what Hamas uses to call Palestinians to fight, it's not far to say that someone who believes that if he dies fighting he will live a better life will fight more aggressively than a person who fights and believes that if he survives after this he might live a better life. You also have to consider the importance of mosques since it's a building that people of the area gather into to hear a speech weekly and has a minaret that can be used to blast propaganda which helps spread the message faster, Islam is the majority's religion in Palestine most groups that are in Palestine are Muslim or have a Muslim majority in them, even the PFLP has sheikhs in it, I don't know enough about christianity or other religions or much about them in Palestine, but I know that a large number of Druze in Palestine are in the IDF and occupation polices forces, both Druze and Islam are religions but the action of their believers are different.

Hakim's post was for learning about Islam, to understand the beliefs of the main revolutionary group in Gaza, because hamas aren't marxist or anything that most of his viewers are familiar with, he's not telling his viewers to convert to it. Hakim is a Muslim Iraqi creator and has for most of his career not talked much about his religion, this is one of the only times he has mentioned it.