I believe Fr. Lemaitre "Big Bang theory" was completely wrong. There was no "Big Bang" however we do have growing evidence compatible with the "Static Universe theory" for "many little bangs." We call them Pulsars and Quasar ejections.
The intriguing "problem" with the "Primeval Atom" concept as applied to Pulsars is we don't understand how it works. How do you take these "Primeval Atoms" and get the "matter" that makes up the universe? That's a trick bigger than feeding thousands with a few loaves and fishes.