First cause isn't the same as the Big Bang. The Big Bang, or more accurately we should say nucleosynthesis, is an effect, not a cause. Popular Science (SciPop) promotes speculation about a possible first cause.
A Theory of First Cause
Alpha and Omega
In Revelation 1:8 the Lord Jesus refers to Himself as the Alpha and the Omega. There's more than one way to understand this, but it's possible to use deductive reasoning to ascertain which is the correct one.
January 2nd
How does Alpha and Omega become a Holy Trinity? This was the first ever example of cause and effect (first cause), and it’s the origin of gender.