No, because watching someone do some act of magic in front of me will make me go through some sort of critical checklist like this:
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Can I be sure that what I saw really happened and wasn't a magic trick or illusion of some kind. This is the most likely answer in every case. I have never seen a genuine miracle that could not be explained by something like this.
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If the thing really happened, what might this say about our understanding of science? Because phenomena that can't be explained is more likely to be some aspect of discovery that we don't know rather than something mystical. This is a hard one to get past and I don't think ever has been.
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If I was convinced that it was real and was mystical, what links this to a particular religion or dogma? Just because the miracle happened in front of me doesn't mean that the bible is correct and that priests are telling the truth.