I will explain below to enlighten you on whats the connection of the original topic about Bitcoin and Religion that OP describing. There some group of people like Bitcoin maxi believes that Bitcoin is all we need and will gonna survive. They put there faith for Bitcoin future price as if they are worshipping it. The definition of religion is just simply having faith and worship on to something that will give you what are wishing for in your life.
Dont view the topic as literal religion like worshipping to a supreme deity since religion has a wide scope and varies depends on the people perspective. Some people worship rock, nature, animals, money and something they cant see. I think this the whole parameters people thinks when they are comparing Bitcoin as religion and not the typical spiritual type.
The crazy price gain makes user become a fanatic on Bitcoin investment because your life can be change if got lucky on your Bitcoin investment like what happened to all those users who invested on Bitcoin on its early stage.
I wouldn't really consider it to be that big. Religion is so huge that people literally conquered lands and killed and enslaved people just to "progress religion to everywhere", and bitcoin people do not have that. Yes there is this overstating things to make it more realistic, but there has been wars and even plagues because of religion, 1/3 of all Europe died because of religion at some point.
I am sorry but bitcoin people are nowhere near that level, we do believe that it is the answer to most financial problems in the world, but that is about it, nothing more. This means it's something we love, but not something we would die or kill for at all, not even close.