They can try to turn Conservative Catholics against each other, but so did the Communists and the French Revolution. They failed. Catholics have the papacy and the magisterium to act as their Northern star.
Evangelicals do not. Protestantism inevitably collapses when confronted by Revolution. The Catholic Church suffers blows, but has always proven resilient in the long run.
Secularism may have the upper hand today, but it may not 200 years from now. Progressive "Catholics" aren't Catholic, period.
I would disagree with that. Many examples to the contrary. But the problem in the US for both cultural Catholics, and cultural Protestants is that most in the the US have no real sense of history. Each generation seeks to reinvent themselves (which is normal in a way), but for the last hundred years or so in the USA, the older generation has not transmitted their values. So we get where we are today.