Unknown Soldier
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All religions and ideologies have done lots of harm. It is the nature of life that most of us do some harm to to others passing through. OTOH, the most harm is usually done by those who become fanatical about their beliefs, no matter what those beliefs may be.
By "fanatical," I assume you mean not able to listen to reason even if harm results or if there is an obvious potential for harm. Many people tend to come along preaching what many people want very much to believe because if what is preached is true, then others think they will greatly benefit. As a result, those believers make the promises they hear their top priority seeking fulfillment of those promises no matter who gets trampled in the process. The "preachers" knowingly add fuel to this fire often avowing the dangers of believing them making out the risks of belief and obedience to be virtues. The obvious result is that believers often do take risks and end up trampling other people because to them the utopia they seek is worth anything to them. Jesus fits this mold of a fanatical and dangerous religious leader in the same league as Jim Jones and David Koresh.
The most common fanatical belief system in the US, at the present moment, is the Dominionism version of Christianity. The sort that Jerry Falwell, Billy Graham, and so forth adhere to. Perhaps we should also admit that harmless, and even beneficial, versions of those ideologies also exist.
Fanatical religions can be harmless and even beneficial if its followers don't take it too seriously or change it to avoid harm and help people. Christians have done so all along. Almost all Christians, for example, ignore Christ's command to be "eunuchs for the kingdom of heaven" or even prohibit the practice of self-castration which they ended up needing to do.