The number of victims quoted is described as completely unreliable.
A widely shared estimate that a million children have been victims is not reliable, but the true total remains unclear.
fullfact.org
It was arrived at by extrapolation.
Sarah Champion, took the number of victims, relevant to the population of Rotherham and extrapolated that number "so scaled up.”, in her own words to the population of the UK (presumably) and applied the extrapolation over a 70 year time period.
Whereas the number of sexual abusers in the Catholic Church is well known.
A figure of 4% of the priests, deacons, bishops, etc of the Catholic Church in USA
the report concluded that approximately 4% have faced these allegations
In addition
Currently there are about 500,000 bishops, priests, deacons etc in the world. 4% of 500,000 is about 18,500 sexual abusers in the catholic church.
If there are 18500 sexual abusers in the catholic church at any one time, imagine how many victims there must be.
The abuse in the catholic church has been going on for centuries.
The abuse has been carried out on children as young as 3 years old.
The Catholic Church has also pointed the finger at other religions as an attempt to divert the blame.
It's very much like the typical pointing the finger at Muslim gangs while the abuse has been going on for centuries in churches where they're supposed to take care of our spiritual welfare, and there was no hue and cry.
It's also like the focus on small boat arrivals when the vast majority of immigration is legal migration, and no-one bats an eyelid at that.
I wonder why the fingers are always pointed at dark skinned people?
All quotes from
https://en.wikipedia.org/wiki/Catholic_Church_sexual_abuse_cases