I consider all religions except Islam to be harmless fun. The exception being those offshoots that practice dangerous rites. But even then they are dangerous only to those stupid enough to become involved with them in the first place.
There are certain religions, such as branches of santeria and various African muti practices, that require human sacrifice.
But you are quite right these are the exception.
Personally, I do not believe Islam is necessarily and inherently dangerous to everybody else. Though it certainly leans in that direction.
In Uganda, Christians are trying to make homosexuality punishable by death. They are also trying to subject family and friends who don’t report it to serious criminal penalties. So much for harmless religion.