All abrahamic religions are equally terrible on those issues. If you look at the fundamentalists they all believe the same. And there's moderate wings of those religions that are better on those issues. The specific religion has little bearing on this. You can't even claim there's a relation to religion at all, even in the atheist USSR they went back and forth on those issues for political expediency reasons.
The context of the discussion was contemporary UK and in that respect Islam does have a worse problem even though, as part of the secular UK, almost all Muslims do not attempt to enforce their beliefs on the rest of society
The death tolls are more tied to whichever empire happened to have a certain religion as its dominant religion as opposed to characteristics of the religion itself.
And then there's the tricky bit of attribution. Were the crusades strictly driven by religion, or was it about control over trade routes? Is the British Empire a Christian Empire or was it more of a capitalist enterprise even if the head of state is also the head of the church? Was Mohammed driven by religious fervor when he started his conquests or was it imperialism? Was the genocide of the Rohingya done because of Buddhist teachings or because of a military junta trying to hold on to power? Do we start tallying the deaths by the Roman Empire under Christianity from 313 AD, or 323 AD? Can we just attribute what Israel is doing in Gaza to Judaism? Etc.
Honestly I wouldn't even know which religion would be the most murderous if you looked at all of human history.