Furthermore, Luke (considered the first historian of the early church and because the truth was important to him) used firsthand accounts and other resources as material for an accurate and complete account of Jesus's life.
Skeptical?
There's Good news. Christianity doesn't say, close your eyes and believe but rather, learn and investigate for yourself. The Bible teaches and encourages us, according to the following scripture verses, to investigate these claims Luke and others make thoroughly:
Thomas said to him, “My Lord and my God!”
"The secret things belong to the Lord our God, but the things revealed belong to us and to our children forever, that we may follow all the words of this law."
Why? Because Jesus provided proof. Jesus lived. Jesus performed miracles so that the people he healed (and those who witnessed these miracles) would have proof.
One of the reasons Jesus choose to perform miracles was so that those who believed would listen closely to his teachings and also believe what he was telling them.
Our choice is this: Do we believe the 12 apostles, disciples, and thousands of people who witnessed and benefited from these miracles...or not?