Evangelical Christians have enormous political power. That's why the last three appointees to the Supreme Court were vetted by pro-Life organizations and Roe v. Wade is in imminent danger.
I'm just pointing out that the Supreme Court is a ridiculous example of this, as they are arguably the most underrepresented group there.
Amy Coney Barrett may be Catholic, but she was heavily favored by evangelicals, with specific interest in overturning Roe v. Wade.
But it's not like Amy Coney Barrett is barely Catholic. She's been heavily involved in the church her whole life, and her career has been centered around a deeply Catholic university. She only represents Evangelicals in situations where their belief overlaps with those of the Catholic church.
Barrett is both deeply Catholic and part of an organization (https://en.wikipedia.org/wiki/People_of_Praise) that features aspects typically more in line with American evangelical Protestantism. The Catholic Church can be a surprisingly diverse group theologically; American bishops are frequently feuding with the Pope over issues like the death penalty and abortion.
American evangelicals didn't get in line behind Barrett and Kavanaugh on account of their Catholicism.
But I still tend to believe that if Evangelical Protestants were really the ones controlling who is nominated and confirmed to the supreme court more than anyone else, we'd see at least a single Evangelical Protestant on it.
Imagine if rather than gaining its independence from the UK, the USA instead of becoming its own independent country, was still called the United States of America, but over time, in practice it had become totally servile, dependent on, psychologically submissive and subjugated to the British aristocracy that rules the UK and Americans worshipped them as demigods.
There are further policies planned in a similar vein.
This is expected to change shortly, due to those very same "three appointees to the Supreme Court".
The assertion that "evangelicals have no power" in the US is simply silly.