Many secular cosmologists believe that the universe came into existence in a singularity, as a result of a quantum event about 14.7 billion years ago. However, this so-called Big Bang theory is not without its problems. Principle among these is the Horizon Problem, which refers to the fact that Big Bangers cannot account for the Cosmic Microwave Background being the same temperature in all directions. This phenomenon would have required different parts of the universe coming to thermal equilibrium by radiation moving at the speed of light. Yet the maximum distance this radiation could travel is considerably less than the size of the universe.
In the 1980s, theoretical physicist Alan Guth proposed the Inflation Theory. In this model, a very rapid expansion of the universe happened from 10-36 seconds to 10-32 seconds after the Big Bang event. This allowed the entirety of the universe to be in close contact for a while, enabling transfer of energy between all parts of the universe.
There is no scientific evidence for this inflation, which is sometimes called the Big Fizz. The extremely short timescale of the event, at the beginning of a period of extremely deep time, gives the whole theory an impression of being a convenient construction, just to make the math work. Moreover, it creates new problems of its own. There are several different models of inflation, and recent work suggesting that evidence for inflation is now available, turns out simply to disprove some of the models, without validating the concept itself.
As biblical creationists, we know that none of these models are correct. God has explained how and why the universe was created in the first chapter of the Bible.
The above article shows us that there is still a great mystery in how the Lord brought the universe into existence. His majestic glory and power did it, but the scientific community wishes to be free from such belief. So they deny creation by the fiat of God. Scripture still stands strong: Genesis 1:14-15 "And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years: And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so." cb
Notes: Ref: Faulkner, D.R. (2014), Has Cosmic Inflation Been Proved? <https://answersingenesis.org/astronomy/cosmology/has-cosmic-inflation-been-proved/ >, accessed 05/17/2017.