Well... i was born and raised in a Christian Church, and knew lots of people who were spiritually cured of all kinds of diseases, many of them incurable. Their doctors would be very awed, and many doctors conceded that the only explanation was calling it miracles.
But there was one that i witnessed myself. My grandma had a serious health problem (dont remember what), and had an irreversible neuron loss, to the point that she behaved like a zombie. She didnt know nobody, she couldnt speak coherently, she pissed at herself... she lost completly her mind, and was actually a zombie.
But my parents, who are very religious, didnt give up, and kept praying for her to become normal again. It was scientifically impossible, as you know neurons does not regenerate themselves.
And yet... after months of being a zombie, her mind started to come back, and back... and she regained it completly! She returned to be who she was, she regained all her reason, and thinking, everything! Even after the doctor had said that her condition was irreversible.
So, yes, i do believe in miracles, cause i witnessed them.
And i also believe in the Christian faith. Even if now im astray, if someday i decide to follow any faith again, surely it will be the Christian faith.