There is no one answer to this question.
Also, I think, it has to be personal too. Otherwise, how could an eternal cause have a temporal effect like the universe? A cause can never exist without an effect if it is a necessary and sufficient condition for a set of mechanical functioning.
Some still insist that the machinery of the first cell may have arisen purely by chance. For example, it is said that if you randomly draw letters from a hat, you sometimes get a simple word like “BAT”.
97% of the water on earth is in the ocean. But on our planet, there is a system that removes salt from the water and then distributes that water around the world. Evaporation absorbs seawater, leaving behind salt and forming clouds that are easily blown away by the wind, dispersing water over land for use by vegetation, animals and people. It is a system that purifies and nurtures life on Earth, a system that recycles and reuses water.
Many people have beliefs about god, but no one knows for sure.
Even assuming universal natural knowledge of God, there are undoubtedly some who deny God’s existence and make arguments in his defence. Some have attempted to reveal contradictions in the concept of God (eg, between omniscience and divine freedom) by comparing God to a logically impossible “square circle”. At best, such an argument can only rule out certain views about God that, in any case, often contradict the biblical image of God.
The question of whether there is a God in the 21st century is heating up. According to a Pew poll, 23 per cent of Americans were religiously unaffiliated in 2014. Of these “nothings,” 33 per cent said they didn’t believe in God — an 11 per cent increase since 2007.
Indeed, we cannot prove the existence of God. But God is something you can’t see, it’s a positivity, a belief, an inspiration, as they say, if you believe in God, even a stone can be worshipped as God, if you don’t Believe, yes, it’s just a rock.
Reference
Pew Research Center (2015) 5 key findings about religiosity in the U.S. – and how it’s changing