Protestantism isn't monolithic. Even from the beginning, even from before the beginning. You have pressures for theological reform throughout the late medieval period that co-occur with peasant revolts and anti-monarchic movements.

From the 16th century you have the big 3: Lutheranism (widely taken up in the Nordic/Germanic world), Calvinism (or "Reformed" theology, majorities in Switzerland and the Netherlands, minorities from France to Hungary), and Anglicanism. The first two were made by theologians, the other was made by an opportunistic king. But even at that time you have smaller branches, like the Anabaptists, the Arminians, the Baptists, the Friends, and some others. After American independence you get another explosion of denominations, some of them on the frontier.

The main thing in common is the rejection of a minority priesthood (thereby ruling out the Catholic sacraments of Confession, Anointing, and Holy Orders), and the expansion of reading and interpreting the Bible to all. Many (but not all) have scripture as the only source of authority, as opposed to scripture + priesthood/tradition in Catholicism. Some believe in salvation by faith and also works, some believe in salvation by faith alone. Some believe that salvation is a choice made by God (predestination), some believe that it is a choice made by both God and each individual.

The idea of predestination, and all other theologies that assert that everything that happens on Earth is to be accepted outright as the will of God, are very close to reactionary politics because there is the premise that things are as they are in a state that is immutable to humanity. It also has the assumption that the majority of people are destined to be excluded from divine favor. This manifests in a "might makes right" mindset, framing the wars and crimes of the ownership classes as the will of God. It is not limited to Protestantism or Christianity; it spans many religions.

If you believe that what happens on Earth is 100% the will of God, you will have a lot fewer ethical barriers, and you can swindle, deceive, and slaughter people while keeping a sort of moral conscience that says "God ordained it".

Most of the denominations that are fueled by the US, and operate hand in hand with imperialism and neoliberalism, are Charismatic and/or Literalist. "Evangelical" just means "[spreading] the Good News". "Fundamentalist" is a little closer to what we're looking for. But the true enemy is essentialism in every form above the molecular level.