This argument is based on a logic error. If a miracle implies God exists, it does not follow that the lack of a miracle implies that God does not exist. (The proper converse of logical implication is the nonexistence of God implies the lack of a miracle.)

So a careful scientists concludes merely that he has no basis for an opinion about the existence of God.

P.S. I believe in God because the neutrino helicity problem is a miracle. :-)