For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men who suppress the truth in unrighteousness,
Here it says men suppress the truth. The truth of what? The knowledge about God.
because that which is known about God is evident within them;
This knowledge they have about God, Paul says, is evident within them. But how?
for God made it evident to them.
This is how. God Himself made this knowledge about Him evident to them. You mean God did? How?
For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen,
Through His creation, they themselves, everyone and anyone calling themselves an atheist has clearly seen His attributes, His power, His nature.
being understood through what has been made, so that they are without excuse. — Romans 1:18-20
They understand through creation. They just suppress the truth in unrighteousness. In reality they have no excuse. There are no real atheists. None have ever existed.
Logically there has to be something that created our universe. Even if you believe in the big bang theory something had to set that in motion. God perhaps?
Why god and not Allah, Odin, Baal, or any of the other thousands of gods other than your own? If there is a diety that set things in motion and then abandoned the universe to its own whims, then by what basis do you declare it to be your god?
If the only claim you can make for the existence of your god is that it is YOUR god, then you cannot make that claim at all.
“Remember the former things long past, For I am God, and there is no other; I am God, and there is no one like Me, Declaring the end from the beginning, And from ancient times things which have not been done, Saying, ‘My purpose will be established, And I will accomplish all My good pleasure’; Calling a bird of prey from the east, The man of My purpose from a far country. Truly I have spoken; truly I will bring it to pass. I have planned it, surely I will do it. — Isaiah 46:9-11
He doesn't abandon the universe to its own whims, He's in complete control of it. Always has been.
You are quoting a book pieced together by Roman politicians at the Council of Nicea in 325. It was pieced together from writings made over the course of the previous three thousand years before that by sheep herders and nomads. They decided to pick and choose what parts they liked, and they even included in new things from Hellenic Paganism to make it more appealing to the Roman people.
It is not proof of anything. It is a good book, but using bible passages as evidence for the existence of God is like using Plato's writings as proof of the existence of Atlantis.
The Bible authenticates itself and therefore is self-authoritative. The wisdom it contains leaves anyone who finds it with no choice but to know it comes from God.
God Himself through His absolute and complete sovereignty preserves His word and keeps it pure, and has used prophets and apostles as pens to write the words He purposed them to use.
But know this first of all, that no prophecy of Scripture is a matter of one’s own interpretation, for no prophecy was ever made by an act of human will, but men moved by the Holy Spirit spoke from God. — 2 Peter 1:20-21
The Bible makes massive claims and then backs them up.
Declaring the end from the beginning, And from ancient times things which have not been done, Saying, ‘My purpose will be established, And I will accomplish all My good pleasure’; — Isaiah 46:10
The Bible is the only writings to have ever declared things before they exist, proving itself to be inspired by God.