I have a few points I think may help:
While this first one may not be a direct, irrefutable peace of evidence, I think it’s still a good point to make:
Between Christianity and other popular religious views, Christianity is the only one that doesn’t require any works to get into Heaven. You can’t earn your way into Heaven. We get into Heaven by believing in Christ, Who paid our debt for us, that when God looks at is, He sees Jesus’ perfect record. Our sins are forgiven and forgotten, as far as the east is from the west.
For more direct evidence:
One important thing to note, is that the Apostles (all but one, which was exiled on an island) died for their faith, having gained nothing for their testimony. They would have no reason to do so unless they fully believed it was true.
The Bible is also completely consistent within itself. It does not contradict itself. Most things in it that would be considered contradictions can be explained by misunderstandings. God directly made the Bible have stories that would confound the wise.
Also, many prophesies made have and are coming true. An example is Israel becoming a nation again in recent times.
