Here's the quote from Matt 16:4
A wicked and adulterous generation looks for a sign, but none will be given it except the sign of Jonah." Jesus then left them and went away.
It doesn't help the Baha'i cause to not only take verses out of context... but to change words in it to make it say what you want it to say. It was his enemies that wanted him to show them a "sign", not a "miracle", and he called them a "wicked and adulterous generation". Then, he gave them a "sign"... the sign of Jonah. Which alludes he what? Him being buried three days and coming back to life. Which, I guess, you could call a miracle. But, you say God doesn't use miracles to convince people? So no one got convinced by Christians telling them that God raised Jesus from the dead? That's the most convincing thing about the Gospels. They believe Jesus conquered death and is alive. And, because he's alive he has proven he has the authority to forgive them of their sins.
I question it, but I question everything. I think it's possibly nothing more than embellished mythical stories. But, if there is a being like the one described in the Bible, an all-powerful Creator, then anything is possible. And miracles performed by Jesus would show that he was sent from that all-powerful God. To do what? Convince people that he is who he says he is... the Son of the living God.
But, if those verses that say Jesus performed miracles, like bringing people back to life and healing their diseases, and by he, himself, being raised from the dead, if those things didn't really happen, then that is deception. That is lying about what happened. That is lying about Jesus coming back to life and talking and walking with people. And, since Christians believe and teach that all those things are real, then they are the ones that are deceived. They are the ones that believed the lie and perpetuated it... for 2000 years. And, since they taught that Jesus performed miracles and rose from the dead right from the beginning, they have been wrong right from the beginning. They have never taught or understood the truth right from the very beginning of Christianity until now... if the Baha'is are correct.
And you ask if a "clear heart" would recognize they aren't literal? Or, is it that a heart that has accepted the Baha'i Faith as the infallible truth would believe they aren't literal, because Baha'u'llah said so? You sound like someone in need of a miracle right now. Can God go beyond scientific laws and heal you? I've got to believe that you would answer "yes" to that. Do you have friends and family praying for you, that God will perform a miracle and cure your disease? I'm sure you do. I know there is a Baha'i prayer for healing. Does it work? I'll bet there are some of us here at RF that are praying for a miracle for you. What if it happens? Sorry, but that would be very convincing that God is real. Maybe not for you, but for me it would. And you know what, I hope it does happen.