Surely you know that that some Protestants believe there are people predestined for hell while others believe in free will; some believe you must be baptised to be saved while others believe baptism is only symbolic; some believe you must only believe while others believe you must also live your faith; some say you can sin boldly, etc.
I don't deny that result, but that was not the intent.
Not the intent? So, Martin Luther accidentally started his own church. Jean Cauvin accidentally started his?
I knwo the Wesley boys didn't at first intend to break with the C of E, but when they got enough resistane they, as I was told, reluctantly began ordaining ministers.
So it wouldn't surprise me if that weren't often how it started. "I REALLY disagree with you about this or that but I'd like for us to work it out," And only later "Okay, that's it, I'm outta here."
Calvin's doctrine on predestination has more to do with God's omniscience than it does the matter of free will. It is somewhat defensible in the fact that the names in the Lamb's Book of Life have been written since the foundations of the world.
But in the matter of salvation, it suggests that God knows the eventual outcome of our struggles, not that there is any manipulation thereof. Hence, the road to salvation is still the same as those who believe in free will.
[...] some believe you must be baptised to be saved while others believe baptism is only symbolic;
I know of no denomination that would suggest that baptism is not a necessary part of the process, though I also know of none (including the RCC) that do not suppose that exceptions do exist- It is the faith and the confession that are mandatory.
There are heated differences around infant baptism, that much is true.
[...] some believe you must only believe while others believe you must also live your faith; some say you can sin boldly, etc.
I know of none that advise one to sin boldly, nor do I know of any that would not recommend living one's faith. Virtually every one suggests that faith is the important component, and that the Blood covers all.
Not the intent? So, Martin Luther accidentally started his own church. Jean Cauvin accidentally started his?
Luther was predated by Wycliffe, and came before Calvin and the other 'geneva reformers'. Anyone suggesting they were somehow in collusion is incorrect, as the head of the reformation was at least 50 years (c. 1500-1550) in the making, and could be argued to have taken 150 years (c. 1500-1650), going all the way to the treaty at Westphalia.
Out of that, and much contention, came the three major denominations of the Protestants: the Lutherans, the Reformed/Calvinist/Presbyterian, and the Anabaptist/Baptists.
How can you suggest that the 'reason was to form other churches'?