@Katypyee
To be an ally you do not have to understand.
You just have to be a total numpty and accept whatever another person tells you that you should believe 😂.
It is not a belief as you put it. Religion is a belief.
Belief ultimately the failure to accept reality in the face of evidence.
It is impossible to change sex. You can believe this is possible in the same way you can pray to whichever deity you choose.
There are numerous religions which have a massive variance on perspectives towards women's rights and homosexuality for example.
When you say "it's not a belief" what you actually mean is that trans ideology is a mantra, essentially an ideology that circumvents biological reality.
Just be a decent person and let people live as they choose.
Excellent. Like women who would like to access singe sex spaces. Living "as you choose" cuts both ways.
Allow everybody to be treated the same.
Again an excellent point. Let equality rule where the rights of trans people are not allowed to trample over those of women.
Do not turn a blind eye to transphobia, just be kind.
What is transphobia? Is being kind allowing male rapists in female prisons?
Just how kind do you want me to be? 
Stand up for marginalised people.
I've spent a lifetime doing that. Will continue to do so.
Trans people do not owe you an explanation or to help you understand.
That's a pretty arrogant stance. You might want to rethink that position because if you want to further trans rights the starting point isn't alienating people, or refusing to engage in widening an understanding a trans person's perception. Put bluntly, when your attitude is "fuck you" don't be surprised when you get "fuck off" back.
They just want to live their lives the same as you do.
Some do yes. However, a not insignificant number don't.
I for example want to live life with access to female only spaces having experienced a serious sexual assault.
Is my desire less worthy?