Unless you are trolling, I think you are mixing up different senses of "not allowed to criticize". In totalitarian states it is literally not allowed to criticize the state ideology. That is not the case for "questioning transgenderism" anywhere I know, unless you are taking about things like literally calling for the murder of transgender persons, which indeed would be illegal in many jurisdictions.
Of course everybody have the same right to question your ideas, as you have to question their ideas. Some people seem to think that their freedom of speech is curtailed because other people are allowed to criticize them back or even ignore them.
On the other hand, there are long histories of philosophical and theological inquiry in the Christian tradition; from what I understand the same is true of Islam. There are certainly times and places in both camps where small deviations were perceived as heresy, and perceived "heretics" were persecuted or killed; but as a Christian, I am as opposed to that as much as any atheist can be opposed to the persecutions of Mao.