In the quest for finding the Christo Dirtylaundrius grail, someone came up with an idea that since they're so many denominations, us Christians just cannot get along. The idea is that each denomination has it's very own Christian doctrine that puts them at odds with everyone else. So basically, there are 45,000 different church denominations with their very own doctrine that puts them at odds with all of the other 44,999 denominations.
I think most of these gallant grail seekers understand that there are a given number of prominent denominations, and many sub-denominations. And this doesn't mean that there's any significant difference in many of them as their identification may only imply a different region or emphasis on a specific biblical truth. At least I'd like to think most of them do.
But even still, we could say that after eliminating the many sub-denominations, there's still a fair amount of denominations that do have a distinctive difference than others. And a fair question to ask is
First off, I would argue that there's really nothing wrong with denominations. The Bible doesn't directly condemn denominations. The Bible doesn't
even condemn having doctrinal differences. The Bible does condemn allowing doctrinal differences to divide. It also condemns placing a leader on a pedestal over others. Especially of course over God. Paul as an example was always careful to make sure he wasn't placed on a pedestal. When church leaders are placed in God's position, the danger is actually a cult being formed, not a denomination.
The history of denominations (the why they exist) is similar to how nations came into existence. They each have a unique historical background. A
unique spiritual foundation resulting in unique giftings and revelation designed to strengthen the entire body of believers. The names of each predominant denomination can give an idea of their spiritual heritage (Baptist, Methodist, Presbyterian, etc.).
So to argue against denominations is similar to arguing against independent nations within the EU. Dissing the member nations of the EU for having their own languages and ethnicity.
Another problem with the vilifying of denominations is that since doctrinal differences are inevitable, many of them are actually not the property of denominations. Many of them are actually personal. There's doctrinal differences between individual members of each denomination. So the accusation mentioned earlier is sort of like asking instead of why not just one denomination?, we have why not just one church? Of course the obvious problem there is that we wouldn't all fit. So we need numerous churches (places of gathering). And these numerous churches have their own names. And in addition, many are represented by a denomination.