I just saw a guy describe himself as christian use a yin&yang to represent the "spirituality/philosophy" section of his blog.

This is good. I am so used to think of syncretism in from the mythology pov that I never realized they are a sign of peace and respect to another ideology.

Doesn't make them harmless toward their members. But the more there are, the less "others" can be harmed. I guess some hippy found that out before me.

You could even make an uninformed estimation that "syncretism-openness" correlates with aggressivity in today's religious communities.