I personally believe that religions are man-made. Even if there ever was some type of "Divine" entity of some type, then everything thereafter throughout the centuries would have to be man-made.
Just think of all the language translations there have been over the centuries and it can be really hard to get exact translations from one language to another.
Now think about all the verbal pieces to it that were there before the written ones were there. If you then think about the verbal piece and consider the childhood game "telephone" where the last person's version is often nothing like the original, how can anything possibly be the way it all started?
I mean, just consider the different versions that people read and/or heard or decided to disagree with who then started their own "religion" simply because what they "knew" or believed was different. In the end, we need to agree to disagree because it's all human beliefs.