I’m going to approach your question from two separate emphases, mainly STYLE of worship services and then MAJOR DOCTRINAL BELIEFS
because there is a similarity in style of worship with some groups despite polar oposite doctrinal emphasis.
The most formal worship style is described as Liturgical. This is a formal, pre-set type of service in which the order of things is the same from one week’s service to the next with obvious differences being the scriptures used and/or holiday and seasonal time in the church calendar.
It also involves very formal and usually quite seasonally influenced vestment colors (priest robes and altar cloths) many of which are usually quite elaborate, ornate and very beautiful.
Obviously this describes the RC (Roman Catholic) church as well as the various ethnic Orthodox groups. But several Protestant denominations also have a very similar liturgical order of worship even tho their doctrines differ sharply.
The main ones of these are Anglicans ( UK) Episcopalians (US) and Lutherans which are all considered liturgical churches.
Some Presbyterians can be considered Liturgical as well depending upon the formality of service order and degree of elaborate vestments. When the late D. James Kennedy was the head pastor at Coral Ridge Presbyterian it was much more formal. The current Pastor prefers things much simpler, wears a suit rather than robes, and eschews pomp and circumstance, not surprisingly since he’s the grandson of Billy Graham.
Liturgical churches can vary quite a bit within this category. That’s why they have developed a shorthand descriptor to indicate this. The most formal and elaborate are known as “High Church”. The ones at the opposite end of the spectrum are termed “Low Church”.
I taught at a Lutheran school which also had weekly chapel services. This particular Pastor was about as High Church Lutheran as it’s possible to be. Elaborate vestments, a full sung (rather than spoken) service, incense, the whole nine yards. We used to joke around that if it weren’t for those pesky little doctrinal distinctives, he’d be a better representative of the RC Church than a whole lot of the more modern (less formal) ones :) He even wore the full floor length black cassock most days just walking around (apart from only during services) which I’ve never seen on any other Lutheran pastor I’ve ever encountered.
On the opposite end of the spectrum you have something like the Quakers which don’t even have a minister delivering a sermon like in most other churches. When they gather everybody sits in peaceful contemplation until someone (or numerous someones) feels
moved to speak and share what’s on their hearts and minds. That may sound quite strange to someone used to a lock step liturgical format but it’s actually quite peaceful and relaxing. It’s a refreshing contrast to the frenetic pace of our current society.
Similarly to the Quakers on the spontaneity scale but usually more noisy (or boisterous) would be many of the Pentecostal denominations. They strongly believe in the leading of the Holy Spirit and feel that a rigidly set program such as Liturgy would stifle that.
And the rest of the Protestant denominations are in the middle between spontaneity and preset service order.
So that gives a general overview of style of worship.
Originally, I was going to describe the major forks in the road for the divergence of several key doctrinal issues as part of this post but will have to get to it later cuz its really really late and I can barely keep my eyes. So I’ll get back to this tomorrow.
One of the best ways to understand Christianity is through the lens of history. That’s what I’ll cover subsequently.
However, I’ve read this in two other posts so far and want to clear it up. Twice it was mentioned that Lutherans came BEFORE Roman Catholicism. It’s the reverse.
Before he posted his famous 99 theses on the door of Wittenburg Cathedral, thus beginning the Protestant Reformation, Martin Luther was an RC Monk so obviously the RC church predated Luther by quite a significant amount of time.