As you say, shame works very well. I'm baffled as to why you would assume that people who hold beliefs different from your own would raise their children without leaning upon the very effective "shaming" mechanism.
I'm also baffled as to why you would think that anyone would be ashamed of their beliefs when they were raised to believe those things. It appears that the left side of your argument isn't aware of what the right side just said.
Edit: In conclusion, your argument does not hold water. It assumes that your opponents do not think deeply upon contentious matters, and only you and yours do (and so, by your account, anyone who shares your beliefs should never feel shame, because they are simply correct). You are dismissing the beliefs of your opponents without bothering to look into the nuance of any single individual's personal stance, and instead painting half our population as extremists. You label all Republicans as "Trumpists" because they didn't vote for Biden. Give me a fucking break. Even the "Bidenists" aren't happy with Biden.
You are the one who should be ashamed, but you know all about that, right? Maybe you should take a break from trying to save everyone else, and talk to a therapist about your savior complex. You might discover that you need some saving yourself.