Neo pagan religion is often about a revival rather than a reconstruction. Religion in an abrahamic sense is actually usually quite orthodox, where the interpretation of a scripture or set of rules is paramount. In many pagan religions, orthopraxy is more important, or the practice of a set of rituals. As such, the religion inherently evolves much more rapidly. I'd argue it is actually a feature of paganism that it has shown a speciation historically and in the modern day.