Rewind the tape to 1900. Everyone who is non-religious assumes the universe has been around since forever: it is eternal. Then people like Edwin Hubble and Georges Lemaître notice that distant galaxies are red-shifted, and they calculate the amount. From this they conclude that the universe is expanding. From this they conclude that the universe must have at one point been compressed to a single point, and then exploded: a Big Bang.

But if there is no red shift, then there is no Big Bang, and the Universe is not expanding. Therefore we go back to where we were in 1900, when everyone assumes that the universe is eternal.