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Men wrote it
They did, and the Bible never hides it. It says holy men spoke as they were moved by the Holy Ghost (2 Peter 1:21). If God made the mind, he can speak through a man without the man ceasing to be himself, and to deny it is to take for granted that there is no such God. The question under this one is Jesus. He treated the Scriptures of Israel as the word of God that cannot be broken (John 10:35), and he promised his apostles that the Holy Ghost would bring to their remembrance all that he had said to them and guide them into all truth (John 14:26, 16:13). His word settles the Old Testament, and his promise stands behind the New. God set his seal on that word when he raised him from the dead, and so declared him to be the Son of God with power (Romans 1:4).
Men chose which books went in
The church did not make any book Scripture by voting on it. The Bible’s authority rests wholly on God who wrote it and not on the word of any man or church (WCF 1.4). The churches received the books that bore his voice. The four Gospels and Paul’s letters were read as Scripture long before any council drew up a list, and the Council of Nicaea, which is often blamed for choosing them, issued no list at all. The gospels that were left out were mostly written in the second century or later, after the apostles were dead.
It contradicts itself
A contradiction is two statements that cannot both be true in the same sense at once. Most of what gets called one is two witnesses telling an event from different places. Matthew tells of one angel at the tomb and Mark of a young man in white. Luke tells of two men, whom the women later reported as angels (Luke 24:23), and John tells of two angels. Neither Matthew nor Mark says there was only one. There are harder places, and Christians have worked through them in the open for centuries. A difficulty you cannot yet solve is not a contradiction you can prove.
It has been changed over time
God has kept his word pure in all ages (WCF 1.8), and the copies bear that out. The New Testament survives in more than five thousand Greek manuscripts, some copied within about two centuries of the originals. The first six books of the Annals of Tacitus survive in one manuscript, copied more than seven hundred years after he wrote, and historians trust that text. The New Testament copies differ mostly in spelling and word order, and no doctrine hangs on any place where the wording is truly uncertain. The great scroll of Isaiah found among the Dead Sea Scrolls is about a thousand years older than the oldest Hebrew copies known before it, and it reads substantially the same.
You are arguing in a circle
Every final authority has to vouch for itself, or whatever vouched for it would be the final authority instead.
For when God made promise to Abraham, because he could swear by no greater, he sware by himself,
Hebrews 6:13 (KJV)
If your final authority is your own reason, you cannot defend reason without using it. The man who says only what science can prove is true has said something science cannot prove. So everyone has a circle at the bottom. The question is which one can hold the weight of the world, and the page on God argued that yours cannot account for the tools you used to make this charge. And the Christian circle touches history at a point where it could have been proved false, a tomb in Jerusalem that was found empty.
Nobody can take it all literally
Nobody should, and nobody reads any book that way. Taking a writer at his word means reading him as he meant to be read. The Bible usually tells you what kind of writing you are reading, a song or a letter or a vision. Read the history as history and the poetry as poetry. When a psalm tells the floods to clap their hands, no one looks for hands. Scripture is its own interpreter, the Westminster Confession says, so a hard place is read by the light of clearer ones (WCF 1.9). This objection is usually aimed at Genesis, and there the clearer places settle what matters most. Jesus spoke of the man and woman God made at the beginning (Matthew 19:4), and Paul compares Adam with Christ as one real man with another (Romans 5:12-19). Where faithful readers have differed over details in the visions of Daniel and Revelation, those details can be held with an open hand.
None of that is reason to doubt what is written as history, and the Gospels are written as history. Luke dates the start of John the Baptist’s preaching by the fifteenth year of Tiberius and names the governor and the high priests (Luke 3:1-2). Paul says that if Christ was not raised, your faith is vain (1 Corinthians 15:17). That is not how anyone speaks of a metaphor.
Under every objection
What God Calls You To Do
An objection can be answered and a man still stay away. Jesus said that men loved darkness rather than light, because their deeds were evil (John 3:19). The trouble between you and God is not finally an argument. You have sinned against him, and you know it.
Christ came for sinners exactly like you. He kept the law you have broken, and on the cross he bore its curse for everyone who trusts him, and God raised him from the dead. So the call is the one Jesus preached. Repent, and believe the gospel (Mark 1:15). You do not have to settle every question first.