One statistic I have heard quoted many times is that since the Reformation in the 16th century 45,000 Protestant denominations have arisen. I have lost track of the times of have heard it said and then quoted as a source.
Today I watched a YouTube video by Ready to Harvest that talked about this and where the figures came from. It is quite interesting to see the original research and the methodology used to come to that number. You may be surprised to know the number is way smaller than 45,000, more closer to 300 main denominations.