Regrettably many people think that all religions are just picking some deity (or deities) to worship, because they route their understanding via Christianity. Plus you get the additional problem of people really not grasping how you can't just translate concepts 1=1. "God" in Christianity is VERY different than "God" in Buddhism. One of my favorite pet peeves is when people take something like the idea of Reincarnation and say it doesn't make sense because they only look at it through the lens of their own (Western, usually) cultural and philosophical conditioning. It's like taking a power plug from Europe and then call it poorly designed when it doesn't fit into a socket in the USA.
Many religions have plenty of very very sophisticated philosophy behind them, and often the belief systems were functional, as far as they went, for people's every day lives. Interesting thing is that some of the philosophical frameworks actually are on an equal footing with scientific materialism, namely the ones in the sphere of nonduality. They're equally unprovable and disprovable as matter-first philosophy, yet materialism has posited itself as first in the minds of most people. Meaning, many people think that all other worldviews must adhere to materialist sensibilities, including ones that challenge the idea that matter comes first - which is actually logically fallacious but people don't like it when that's pointed out.
Keep on studying!