A common mentality among atheists is that in order to be valid, a single piece of evidence must single-handedly prove all of Christianity. What I mean by that is that I've often seen them dismiss evidence based solely on the fact that it doesn't prove Christianity, either specifically (e.g. the cosmological argument does not indicate which god exists), or on the whole (e.g. evidence that Jesus was crucified does not prove all of Christianity).
In reality, evidence can be seen as being more like a single piece of a jigsaw puzzle. It is very rare for a single piece of a jigsaw to indicate the full picture. The single puzzle piece in the header image, for example, shows a man's mouth. For some reason, every time I look at it, Nicolas Cage comes to mind, suggesting already that if you were to show just that one puzzle piece to me without me knowing exactly where it came from, I'd be more likely to assume it's him than Jesus.
And that is rather the point. I chose the "best" puzzle piece as my example. It shows the majority of Jesus' face, as opposed to a portion of His forehead, or His robe, or even the lamb, which would really throw you off. So really, even asking for the "best" piece of evidence for Christianity would be illogical.
But when we're not limited to just one piece, we start to get a fuller picture. We compile numerous pieces of evidence, some of which could point in other directions, but when combined with others, only really points one way. When all the facts are taken together, Christianity is the worldview that ultimately emerges victorious.