My parents were once coke addicts. They turned their lives over to Christ, and by faith are clean, taking care of their children.
To me, this is all the evidence I need to believe in Christ. I don't expect it to convince anyone else though.
Further, if you can't articulate what would be enough to disprove your ideas then you are being intellectually dishonest. Rational scientific reasoning means having things that would disprove our ideas if they were found and having alternative ideas to which we are willing to subscribe.
I think that people turning their life around because of faith in Christ is evidence in support of the hypothesis that faith in Christ can be good. I think that the hypothesis is reasonably derived form Christianity; thus in support of it.
I acknowledge that there are other theories that may account for the outcome; But my experience has updated my prior belief about the existence of God to a point where I believe. There's an alternate theory to which I give less belief but which is also reasonable: humans in-born mechanisms to 'feel' faith and thus drastically change their psychological makeup for the better is something that evolved to improve pack cohesion.
If we found, for example, that for the majority of folks following the teachings of Christ in faith leads to a shitty life, then that would reduce my belief. If we found that Dogs or Apes also have these cerebral faith-mechanisms then that would improve my belief in the alternative theory. Lack of such evidence, though, does not reduce my belief in the alternative theory because any number of causes of faith-brain-structures could be limited to the evolution of humans.
Again, this is not an argument that you, or anyone else, should believe: just an explanation.