If "the actual human beings" are indoctrinated beyond any chance of redemption, who says I need to keep trying?
Honestly, you probably shouldn't try. You seem like you are in a bad place at present to attempt to do so. If you do attempt your first motive should not be to change someone else but to do so for yourself.
Harboring an active grudge can be embittering. The brain is plastic. You can over many iterations of leaving the emotion and stimuli connection unchecked can reinforce it and strengthen the connection beyond what logic can undo. It can be unhealthy. A lot of traumatized atheists, or those who continually allow themselves to reinforce that religious people are inferior humans in a meaningful way, can be quite harmful in pluralistic spaces because they become blinded to the line between religious people existing and religious oppression in the exact same way a lot of religious people do. When you allow that to happen it means that religion is still controlling you. If it can hammer your emotional buttons whenever it's present and make you feel attacked just for being around it that is power that owns you. The further down that path you travel the harder it is to undo.
The ability to gain distance and a level of neutrality is actual freedom. It makes dealing with religion feel less personal and gives more space to react in a wider range of ways. The righteousness of perceiving yourself as justified in an overreaction is seductive. You want to bite back harder than you were bit...But every time you do you lose a little bit more of your objectivity. There is a freedom in letting go.