Predications based on the Big Bang can account for less than 20% of the mass and density of the known, observable universe. Nor can this theory explain the discordant data on red shifts, galaxy distribution, colliding galaxies, the abundance of helium, and why the movement of galaxies appears to be speeding up, and so on.
To bridge the fatal discrepancies between observation and theory, and to account for acceleration, the greater than predicted gravitational influences, the missing 80% of the universe, and so on, the acolytes of this religion invent multiple universes, alternate realities, and hypothetical, invisible, undetectable substances(their god), and supernatural constructs such as "inflation," "dark energy" and "dark matter." And yet, although proposed as a patchwork fix, to paper over the increasing number of holes in this theory, these constructs actually refute the big bang and support instead the theory of the eternal, infinite universe.
Inflation, for example, requires a density at least 20 times larger than that predicted by big bang nucleosynthesis, the theory's explanation of the origin of the light elements. That density, like the missing matter, excessive gravity, expansion, the clumping of galaxies, the age of distant stars, etc., can be accounted for not by a big bang, but a infinite universe.
Not a single quantitative prediction made by the big bang theory has been validated by observation. Instead, the proponents of this religion engage in what is little more than card tricks and "slight of hand," where instead of dealing from the bottom of the deck, they insert and slip in new theoretical constructs and an increasing array of layer after layer of flexible fluctuating parameters that can be adjusted retrospectively willy nilly and after the fact to explain away discrepant observations and to support a failed theory.