The Holy Spirit began to awaken the Church during the Reformation.   He used men with a Love Of The Truth to study the Scriptures and revealed to them that the Gospel is about how God has provided Grace Through Faith as the means for men to be Saved.   

What happened next was some of Satan`s finest work - he turned Christians against each other.   

And I am not just talking about Catholics against Protestants and Protestants against Catholics.   

He turned Protestants against Protestants.   How did he do this?   

The same way the Holy Spirit did - with men.   And what is most amazing is that he used the SAME men.   

Yes, those men who received Revelation and Boldly broke with Catholicism under the Inspiration of the Holy Spirit in short order gave themselves over to Pride.   

For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Holy Spirit Father, but is of the world. 1Jn 2:16

Now, in their defense these great men of the Reformation had no experience other than the heavy-handed, dogmatic, burn-at-the-stake, stranglehold of Catholicism

So, it was `natural` for them to emulate the Catholic church in indoctrinating their followers to see non-followers as Heretics.   

When I say `natural` I mean Carnal - not Spiritual.   

And so, we ended up with Denominations - the product of Ignorance and Pride.   

This is a prime example of how Satan used the Pride of men to Pervert the purpose of the Holy Spirit.   

What is the purpose of the Holy Spirit?   

Till we all come in the unity of the faith, and of the knowledge of the Son of the Holy Spirit, unto a perfect man, unto the measure of the stature of the fulness of Christ: Eph 4:13

To make it perfectly clear:
Unity is Good
Denominationalism is Evil.   

Here we are 400 years later having learned nothing from the Holy Spirit about Unity.   As a result the Church is Weak and Satan has placed his minions at the top of the Seven Mountains of Influence.   

Does is really matter whether we sprinkle or dunk?   
Does it really matter whether we sleep or wake when we pass away?   
Does it really matter how we interpret Revelation?   
Does it really matter whether we Worship Physically with Emotions or not?   
Does it really matter whether we observe Saturday or Sunday as the Sabbath?   

I could go on pointing out issues that Divide us into Denominations but the answer will always be NO!   they are not justified by the Holy Spirit - only by men.   

Such men need to give up control of `their people` and let the Holy Spirit Unify the Church.   A unified Church will storm the Gates Of Hell.   

If you take the intersection of all declarations of Faith from non-cult Denominations you will find that Christ Jesus the Son Of God is Saviour and Lord.   

And that is what Jesus said His Church would be built upon.   

And Simon Peter answered and said, You are the Christ, the Son of the living Holy Spirit. Mat 16:16

And I say also unto you, That you are Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it. Mat 16:18