Not only did the Fathers of the Church regard creation as beginning with something smaller than a mustard seed, the Jewish scholar Nachmanides, was of the same view.
Now, if you are a short-canon protestant, you are under no compulsion on the basis of the Scriptures to believe in creation ex nihilo (since the only Scriptural basis for the doctrine is in Second Maccabees, in the exhortation of Solomonia to her sons to accept martyrdom rather than renounce the Torah), but most Christian and Jews accept the doctrine. I would point out that the most refined theoretical model of the Big Bang, Hawkings null initial condition model, looks remarkably like a mathematical model of what a universe created ex nihilo, with time itself created, would look like from the inside.
bttt