What is the worst religion in existence?

[Anomalocaris]

I'd have to say that Islam is the worst. Worshipping a prophet that is supposed to have married a 9 year old (who he started raping at 6 IIRC) is the absolute lowest of the low. No other religion is that bad.

I have to rank Judaism as worse than Christianity, if only because Judaism gave birth to Christianity as Islam.

I find Buddhism and Hinduism to be somewhat less bad than all three of the Abrahamic religions.

The reality of the matter is that Abraham, Jesus, Muhammad, and the Buddha are all fictional characters who didn't exist at all, but the fictional stories about the Buddha are less bad than the fictional stories about Jesus, which are less bad than the fictional stories about Abraham, which are less bad than the fictional stories about Muhammad.

Define “worst”

Condone or promote practices which offends personal sensibility? In that case marrying a 8 year old hardly holds a candle to promoting human sacrafice on a massive scale, or to calls for mass suicides, or to traffic in slaves on a massive scale

Doing large amount of harm on a per capita basis?  Which religions promotes human sacrifice, call for mass suicide, or demand traffic in slavery most enthusiastically?

Doing large amount Of harm in total?   In that it is hard to argue with Islam and Christianity simply because they are so prevalent and so have the opportunity to spread over so many people, so even if per capita harm is less. Aggregate harm is surely more.

You can surely conceive of other manners of measuring “worst”