The question posed: If a Miracle Came, Would it Convince You? is the wrong question.
Flippant answers, such as “Revive my favorite cat, you know, the ginger one that died a few years ago, and then make it draw a picture of heaven while whistling ‘Strangers in the Night'” might convince the most ardent of Heathens, but really this whole premise – the question asked and the answers given are completely missing the point.
The right question should be asked of a true Believer:
“is there anything: any fact, any words you could be told, any words you could read, any sounds you could hear, any sensations you could feel, any data you could access, any reason or evidence you could consider, any thing that could change your faith in Me?”
The answer for the true Believer is of course “no”. Nothing. Nada. Zippideedooda.
By definition, Faith is unshakable, unalterable, unquestioning and unreasonable and requires no falsifiable evidence in order to maintain Faith. That’s the beauty of it: Faith can’t be beat! Why else do you think I Created it?