The argument from division, or the argument from denominations, is a commonly used tactic among heretics and unbelievers alike. It is an effective strategy, for as Christ Himself said, a house divided against itself cannot stand. How, then, can Christianity stand if there are so many denominations?
Atheists use this argument in two main ways. The first is to say that because there are too many denominations, Christianity can't be true. They can't all be right, but they can all be wrong. Thus, the atheist just takes the next step: They are all wrong. The first problem with this is that actually, while they can't all be right, as there are indeed many pseudo-Christian religions that are mutually exclusive from each other and from the pure faith, many denominations are so similar that they need not be considered mutually exclusive. We have minor doctrinal disputes, but Jesus won't send anyone to Hell for their views on infant baptism, for example.
But this leads us to the second way the argument is used. Even if these disputes are minor, why do they exist if Christianity is true? Wouldn't an omniscient God be able to write a book that can't be confused by the faithful? The simple answer is that not even a flawless product can eliminate user error. Blaming divisions in the Church on the Bible is like blaming a camera for blank images because the photographer forgot to remove the lens cap.
An excellent example of user error is KJVOnlyism. KJVOnlyism, without intending to offend KJVOnlyists, is the dumbest dispute in the entire Christian faith. It is utterly baseless, it is indefensible, it is very easy to refute, and, most relevant to this article, it didn't come from the Bible.
As shown in the header image, KJVOnlyists can be quite... well, let's just say the only reason I don't tear my hair out because of them is because God poured His blood out for me. I can't be angry at them for making errors I once made or for committing sins I once committed. Nevertheless, it should be obvious from the header image that this particular example (not that they're all that crazy) wasn't pleasant to talk to.
Most relevant is the time frame. In the original article, I affirm what I have affirmed since before I started this ministry: The Bible is the word of God. The KJV, which is a Bible, and the very Bible this guy uses, is the word of God. The NIV, which I rarely use these days anyway, is also the word of God. This is because they are both translations. The whole point of a translation is to be the same source in a different language. If I ask a French person "bonjour, ça va?", and someone asks that French person "hey, what did Brian say?", the French person would be 100% correct in saying "he just said "hello, how are you?" Now here's the catch: He could also legitimately say "he said hi, how's it going?"
Already, using nothing but my retained knowledge from my high school French lessons, I have shown how pathetic the KJVOnly dispute is. Why should it matter if your Bible says, for example, "But foolish and unlearned questions avoid, knowing that they do gender strifes" (2 Timothy 2:23 KJV) or "Don’t have anything to do with foolish and stupid arguments, because you know they produce quarrels" (2 Timothy 2:23 NIV)? It's the same thing phrased in a different way.
In fact, I used this verse quite intentionally, because KJVOnlyism is a foolish, unlearned, stupid argument, which the Bible in every translation tells us to avoid. The reason so many divisions exist within the Christian faith is that too few Christians have the wisdom to avoid them. This leads to... strifes and quarrels, just as 2 Timothy 2:23 tells us. When you see Christians running around saying "you're not saved because you read the wrong translation", or "you're not Christian because you baptise babies", or "you're a heretic because you don't drink communion wine from the same chalice", you're not seeing a flaw with the Bible, nor even an area of valid dispute within it. What you're seeing is Christians being, well, a bunch of numpties. The Bible isn't in error, they are. The Bible isn't unclear, they're clearly ignoring its clarity. Human error is quite different from Biblical error.
And so you see that the argument from denominations doesn't work no matter which angle you approach it from. When you point out that Christians are divided, what you prove is that Christians are human, and are therefore flawed. Well congratulations, you've pointed out that what the Bible says about us is spot on... how does that have any implications on the truth of the Christian faith or the sufficiency of its scriptures?
When we look to mankind, we are as doomed as we are perishable. No human system can save us, including atheism. But when we look to the word of God, we see how the only perfect human being to ever exist can save to the uttermost those who come to God by Him, seeing He ever lives to intercede for us. See, one thing all Christian denominations believe (and denying this fact makes one necessarily unChristian) is that Jesus died for the sins of humanity so that though we deserve the wrath of God, we can instead receive eternal life through faith. This is a great assurance that unites all Christians, regardless of denominational differences. If you wish for eternal life, don't worry about that weirdo over there who thinks guitars are the devil's instrument, ignore that plonker who thinks using the left hand is immoral, and forget that goon who insists women should always wear skirts and mantillas. You can no more be saved by trivial doctrine than by running from God. Rather, confess the Lord Jesus, and believe God raised Him from the dead, and you will be saved.