Most Protestant denominations are over style, not substance.
Among those who accept Sola Scriptura, the main divisions would be:
Infant Baptism vs Believer’s Baptism
Calvin vs Arminius (or should I say Augustine vs other Catholic theologians)
In 40 years as a Protestant, often using military chapels with varying denominations providing the pastor...that is about it.
If Sola Scriptura is the norm, then who needs Calvin or Arminius?
What about whether “signs” are still valid? I believe that is one of the main differences between Pentecostal Christians and other Reformed Christians. Oh and I mean Pentecostals who believe in the Trinity.