While I do think there are good reasons why we can trust our Bibles (see here), I do not think all people need this kind of persuasion.
The gospels are the Word of God written by men empowered by the Holy Spirit to write directly and forcefully. In John 14:26 and 16:13-14, Jesus promises the Holy Spirit’s presence to help the Apostles remember His teaching. This power is evident in the writings themselves. One church historian puts it like this:
"They carry about them a self-evidencing quality. They carry theirThis self-evidencing quality lead Charles Spurgeon to say that we do not defend the Bible in the same way we do not defend a roaring lion, the lion can fend for itself.
uniqueness on their face. They have always exercised, and still exercise,
an unparalleled power upon the lives of men." (Bruce L. Shelley. 1995. Church history in plain language, Second edition. Dallas, Texas: Word
Publishing. p. 61)
Another perspective, given by a modern theologian, is also instructive. Wayne Grudem says, “It has been the testimony of Christians throughout the ages that as they read the books of the Bible, the words of Scripture speak to their hearts as no other books do” (Wayne Grudem. 1994, 2000. Systematic theology. Joint Published by Great Britan: InterVarsity Press and Grand Rapids, Michigan: Zondervan Publishering House, p. 66).
This is important to recognize because many Christians accept the Bible on this basis alone. They never seek to understand the evidence from history. This is not the best approach to understanding the gospels, but it would be wrong to say that these Christians accept the gospels without evidence. They find their evidence in the words themselves.