When dealing with skeptics you may hear, “If Christianity is true, why are there so many denominations?” Or “How can Christianity be ‘the truth’ if you can’t even agree amongst yourselves?”
This person wants to claim that the theological differences between various groups of Christians proves that our beliefs are inconsistent. That’s obviously not true, but it can be hard to explain why off the cuff.
We can’t deny that Christians disagree with each other on a lot of things. We disagree about how to govern a church, how to worship, and how salvation works. We argue about authority, tradition, and money. We differ over when Jesus is going to come, how Jesus is going to come, and what is going to happen when Jesus comes.
But we do not differ over the presence of sin, the need for a savior, the fact of the cross or the resurrection, or whether Jesus will return. We know what the Good News is, who needs to hear it, and what will happen to those who don’t accept it.
In short, the basics of Christianity are accepted by pretty much everybody, and the fact that we cannot agree about a variety of secondary issues has no bearing on whether or not the core tenets of the faith are true.