The reason religion is so powerful

[John 6IX Breezy]

This is why religion is so dangerous. Since God is above everything, so is religion, as the cause of its existence is God, and God is absolute. So your beliefs are absolute.

I must have missed the part where you explain why being above politics (or everything else) is dangerous?

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I suppose to test this, we'd have to work out whether people have been more or less willing to do violence for political purposes than for religious purposes. 

It's also worth noting that governments have a monopoly on violence. And to be in a political party is to have a conviction as to how and when your government should implement that violence. Perhaps this is why groups and ideologies (including religion) become dangerous when they join or are hijacked by governments—because they transform into a political party.

But as Macoleco mentioned, religion by itself just tends to have a monopoly on things like God, beliefs about the afterlife, etc.