Well, just so you know that your personal belief is considered just as ‘anti-trans’ as disbelieving anyone is trans.
As people have pointed out though, male people with trans identities should be considered to be at least the same risk that all other male people in the UK of committing sex crimes. Unfortunately, your personal belief doesn’t even come into it.
In fact, whether a male in the UK is ‘trans’ or not has made no reduction in the statistics surrounding ‘trans’ people committing sex crime vs all other male people. It can be said that ‘trans’ may be irrelevant when it comes to assessing the risk level from a safeguarding view.
The base of being a ‘male’ person is still the reliable indicator.
Your personal delineation of who is and is not ‘trans’ doesn’t reflect the material reality.