Atheists try to tell us either that God doesn't exist or that they find it impossible to believe in a God.
The Bible says (in Psalm 19):
The heavens declare the glory of God;
And the firmament shows his handiwork.
Day to day utters speech,
And night unto night reveals knowledge.
There is no speech nor language
Where their voice is not heard.
Think about it. The nearest star to the earth is so far away that it takes light from that star, travelling at 186,000 miles a second, four years to get here. Some stars you can see with the naked eye are 4,000 light years away. Light arriving on earth from those stars just now left when Abraham and Sarah got married.
It would take light (travelling at some 670 million miles an hour) more than 100,000 years to travel the length of our galaxy, the Milky Way. There are billions of galaxies. There are about 200 billion billion stars in the known universe.
If the sun were hollow, 1,300,000 planets the size of the earth could fit inside it. There is one star which, if hollow, could fit 64 million suns inside it. There is a star in the constellation of Hercules which could fit 100 million of those stars inside it. The largest known star, Epsilon, could swallow up several million stars the size of that one.
Could you stand somewhere unpolluted by smog on a cloudless night, look up at all of that and pretend it came there on its own?
Early in the book of Romans, Paul seeks to establish that all of us are sinners - Jews, Gentiles, you, me, whoever - in order to demonstrate that we all need a Saviour. (Either we accept the price He paid for our sin or we pay the price ourselves, which would be fearsome.)
But what, you might say, about those who have never heard the gospel? Those who haven't heard the gospel, says Paul, will be judged according to the knowledge of God they had. He explains it like this (in Rom 1:20):
For since the creation of the world his invisible attributes are clearly seen, being understood by the things that are made, even his eternal power and Godhead, so that they are without excuse.
Immanuel Kant wrote:
It is impossible to contemplate the fabric of the world without recognising the admirable order of its arrangement and the certain manifestation of the hand of God in the perfection of its correlations. Reason, when once it has considered and admired so much beauty and so much perfection, feels a just indignation at the dauntless folly which dares ascribe all this to chance and a happy accident.
The Bible says (in Psa 14:1):
The fool has said in his heart,
"There is no God."
The word used for fool in the Bible does not refer to someone who is mentally deficient, but someone who makes foolish decisions. (It infers a malicious refusal to acknowledge the truth.)
Deciding there is no God and trying to prove to oneself that that's true is a foolish decision indeed.