I want to offer another perspective.
I knew someone who got married at 16. The groom was 18, they both came from religious families, and they ended up divorcing at like 22, which was basically a few months after they moved to a liberal area on the west coast.
I don’t think any sane person would call this grooming. At no point was I given the impression that the husband in this situation was abusive. However the situation was fundamentally fucked in a way that was unfair for both parties. My friend felt pressured to be a homemaker while still in high school, while her ex felt even more pressure to be a provider despite having no real emotional or financial capacity for doing so. They also both tried to make it work much longer than they should have, which inflicted a further set of scars.
We live in a world fundamentally more complex than what the average person had to experience 100 years ago. We don’t let teenagers do things like buy alcohol or smoke cigarettes. It is almost expected that 18 - 21 year olds in the US will be on some major level dependent on their parents.
Even in cases where there isn’t abuse, we shouldn’t be letting minors get married. It is just an unfair position to put both parties in.
I get what you’re saying but instilling fucked up religious values in a kid is a completely different thing than marrying off a sixteen year old to a middle aged man.