SarahAr, you said Going with the dictionary definition of transgenderism as A state or condition in which a person's identity does not conform unambiguously to conventional ideas of male or female gender then transgenderism is not an ideology.
I am a woman, a female, have XX chromosomes etc. However, I do not conform to conventional ideas of 'female gender'. I do not wear make up, dresses or skirts, I hate shopping, I am good at maths, I have 'engineer' in my job title etc. This does not make me transgender. Hence believing it does is an ideology.
This is why I , and possibly a good deal of other women find the whole transgender ideology so insulting, as it implies that I am not a woman because I don't dress or act like a woman.
Let men act and dress in any way they like (normal caveats apply) and be proud to be MEN. Ditto with women who don't 'conform to conventional ideas on women'. Let them act and dress in any way they like (normal caveats apply) and be proud to be WOMEN.
For those with gender dysphoria I understand that may be a bit more complicated than that, but perhaps if society, and in particular MEN were more accepting of people that didn't conform to gender stereotypes (e.g. feminine men) then perhaps less people would see their bodies as the problem.
To avoid confusion, when I say woman and man I'm referring to the sex determined at conception, not gender. Its a sad state of affairs when I have to be explicit about what I'm referring to when I say man and women.