That's because you aren't looking for them. Yes, religion is declining among Westerners. Oddly enough, our numbers are declining too.
It has nothing to do with knowledge.
Christianity and Islam are both growing globally. There are projected to be over 3 billion Christians by 2050 and over 2 billion Muslims by 2030. But, yeah, it's all a fad. Sure. Go with that.
The future belong to the faithful. People like you will be a curiosity.