Sgt. Pepper
All you need is love.
Says the man that just recently was bashing the Catholics.
I'm reposting what I wrote on a similar topic because I think the claim that various Christian denominations agree 99.9% of the time is simply not true.
The truth is that Christianity has many conflicting beliefs that contradict one another, such as conditional salvation vs. unconditional salvation, the proper baptism (sprinkled with water vs. fully immersed), female pastors, and the "end-times" (the rapture, pre-tribulation, mid-tribulation, and post-tribulation).
Many Christians have the perpetual habit of accusing other Christians of not being "true Christians," and this accusation is as old as Christianity itself (read 1 Corinthians 1:10–17). The problem I have with Christians accusing other Christians of not being true followers of Jesus is that they can never agree on what the Bible truly says, and they constantly argue, insult, and fight one another about what they believe the Bible teaches. The truth is that if you ask the same theological question to a broad group of Christians, you will receive very different answers. All of these Christians will cite the Bible in an attempt to defend their answers, even though their answers are very different and contradictory. I think that it is also worth noting that they don't agree on whether salvation in Jesus Christ is unconditional or not, although they all read the Bible. They have diverse biblical interpretations and church doctrines about salvation, which is defined as Calvinism vs. Arminianism (unconditional salvation vs. conditional salvation). Some Christians claim that a person's salvation is conditional, and they would quote a few scriptures they believed supported their belief. Some Christians claim that a person's salvation is unconditional, and they would quote a few scriptures they believed supported their belief. Other Christians claim that baptism or speaking in tongues is essential for salvation, and they will provide a few scriptures that they believe support their position. They contradict each other, but they all believe they are right.
Questions about how to properly baptize believers (fully immersed in water or sprinkled with water), whether it is biblical for women to be pastors, and about the alleged end times (pre-tribulation, mid-tribulation, post-tribulation, and the rapture of Christians) would elicit the same kind of derision among Christians. There are also churches claiming to be the "true church, which implies that Christians in other churches are wrong in their theology and biblical interpretation. They even argue and debate about whether Jesus' mother remained a virgin after giving birth to him or if she had other children after him.
The truth is that Christians are deeply divided, with different churches subscribing to diverse beliefs and readings of the Bible that have emerged in both historical and modern Christianity. Catholics and Protestants have different doctrines, dogmas, and interpretations of the Bible. So do Mormons, Jehovah's Witnesses, Messianic Jews, and Orthodox Christians, which include Eastern Orthodox, Oriental Orthodox, Ethiopian Orthodox, and Greek Orthodox. There are also Baptists (First Baptist, Second Baptist, Southern Baptist, Reformed Baptist, Primitive Baptist, Anabaptist, Freewill Baptist, and others), Methodists, Mennonites, Seventh-day Adventists, Assemblies of God, Quakers, Anglicans, Nazarenes, and a plethora of other Christian churches that aren't listed here.
Ironically, Christians all believe that they are correct about their beliefs and everyone else (including other Christians) is wrong about theirs, but then they have the audacity to claim that the Bible is the word of God and Christianity is the only true religion in the world. In my opinion, there's no reason to believe any of them. I think it's unreasonable for any Christian to claim that their biblical interpretation and theology are correct while insisting that other Christians are wrong, that the Bible is divinely inspired, and that Christianity is the only true religion in the world. It is also irrational, in my opinion, that Christians expect non-Christians to accept the Bible as divinely inspired and the final authority on moral issues, yet they can't agree on what the Bible says.