While some claim that the Bible is full of contradictions, this simply isn't true. The number of apparent contradictions is actually remarkably small for a book of the Bible's size and scope. What apparent discrepancies do exist are more curiosity than calamity. They do not touch on any major event or article of faith.
Here is an example of a so-called contradiction. Pilate ordered that a sign be posted on the cross where Jesus hung. Three of the Gospels record what was written on that sign:
In Matthew: "This is Jesus, the king of the Jews."
In Mark: "The king of the Jews."
In John: "Jesus of Nazareth, the king of the Jews."
The wording is different, hence the apparent contradiction. The remarkable thing, though, is that all thee writers describe the same event in such detail -- Jesus was crucified. On this they all agree. They even record that a sign was posted on the cross, and the meaning of the sign is the same in all three accounts!
What about the exact wording? In the original Greek of the Gospels, they didn't use a quotation symbol as we do today to indicate a direct quote. The Gospel authors were making an indirect quote, which would account for the subtle differences in the passages.
Here is another example of an apparent contradiction. Was Jesus two nights in the tomb or three nights in the tomb before His resurrection? Jesus said, prior to his crucifixion, "For as Jonah was three days and three nights in the belly of a huge fish, so the Son of Man will be three days and three nights in the heart of the earth" (Matthew 12:40). Mark records another statement that Jesus made, "We are going up to Jerusalem, and the Son of Man will be betrayed to the chief priests and teachers of the law. They will condemn him to death and will hand him over to the Gentiles, who will mock him and spit on him, flog him and kill him. Three days later he will rise." (Mark 10:33,34)
Jesus was killed on Friday and the resurrection was discovered on Sunday. How can that be three days and nights in the tomb? It was a Jewish figure of speech in Jesus' time to count any part of a day or night as a full day and night. So Friday, Saturday, and Sunday would be called three days and three nights in Jesus' culture. We speak in similar ways today -- if a person were to say, "I spent all day shopping," we understand that the person didn't mean 24 hours right?
This is typical of apparent contradictions in the New Testament. Most are resolved by a closer examination of the text itself or through studying the historical background.