All religions have mysticism in common. We are all connected.
Buddhism is the opposite of dogma. Granted there are dogmatic Buddhists, but they are missing the point of Buddhism. It is more about deconstructing beliefs than it is about creating them.
I once had a wise woman in the Sangha laugh at me when I told her I was a pagan. I was taken aback ad she offered no explanation. I later asked my husband what it meant and he told me she probably thought it was funny because all Buddhists are essentially pagans. Goddess worshipers and earth lovers. Om Tara Tu Tare!
This conversation also reminds me of some things I heard the Dalhi lama say once. He said that if people find refuge in Christianity it is still a step towards knowing inner peace. (Something like that). This makes me think and from my experience in different Sanghas that real Buddhists are quite tolerant and compassionate to all paths. People are not simple and neither are their beliefs. And most western Buddhists have a pagan, Christian, or Jewish background. Hard to separate it out when its that ingrained don't you think? Ever heard of a JewBoo?