Why Does it Make More Sense to Believe in God Than Not?
Either a thing is or it isn't, God included. God either exists or doesn't exist. If God exists then He exists for everyone, whether everyone believes in Him or not. Some believe that truth is whatever we believe it to be, but no-one really lives that way. Most people who refuse to believe in objective truth do so because it suits their lifestyle. When people deny the objective truth of the existence of the one true God it is often because they don't want to live by it, not because it is illogical. It is a fact that God can be known with certainty from the things that He has made (Romans 1: 19-21). It is also obvious that nothing in God's creation is self-caused and so everything in God's creation is evidence of a cause outside of itself. So, it makes more sense to say that God exists.
NO-ONE CAN PROVE THE EXISTENCE OF GOD
When people say they want proof that God exists, they most often want evidence that is perceived by the senses. But, for those who reject the obvious evidence from creation itself, it should be noted that not everything that exists can be proven to exist by the physical senses or in a scientific way, (e.g. love, hatred, peace of mind); in denying the physical evidence you could say God is in that category. God is above our intellects because He knows more than we do. God is a Mystery. A mystery is something we know partially, not completely. All those things that are difficult to know about, and that can never be known completely in this life, they exist nonetheless, whether we want to believe in their existence or not. God is in this category.
IF GOD EXISTS, WHY IS HE HIDING?
God is spirit. A spirit is invisible. A spirit is an individual being with intellect and will. God is the one supreme Spirit Being with an all-knowing intellect and an all-powerful will. We humans all know that we are not God because we recognise that we fall short of having an all-knowing intellect and an all-powerful will â€" that's if we're being honest with ourselves! "If you understood him, it would not be God" (St Augustine). "If I cannot completely know even a daisy, still less can I completely know God." (Baron von Hugel). We don't really know ourselves all that much. We don't know how healthy we are â€" we could die at any moment. We don't know how intelligent we are â€" our capacity for knowledge is not measurable. God isn't hiding, He holds us in existence invisibly.
THERE IS NO EVIDENCE OF GOD'S EXISTENCE ANYWHERE
God does leave evidence of His existence in His creation. There is abundant evidence that the universe is very carefully designed. Francis Thompson once said, "An atheist is a man who believes himself an accident." Design doesn't happen by chance - not ever. There's always a designer. The design in the universe presupposes a Designer. The order in the universe presupposes an Orderer. The intricate detail of the universe with all its order and complex design presupposes an Intellect. The fact that there is order that was ordered by an Intellect presupposes that the Intellect willed to order. Therefore, the order in the universe also presupposes a Will that willed to order. The Intellect that willed to order the universe is the Spirit we call God. Evolution theory pleases the atheist because it suggests that life is the result of blind forces, but the evidence points in the other direction â€" toward purpose, plan and design. We know that if everything exists or moves, there must be a Cause to that existence and motion. The First Cause of everything is God. The Designer of everything is God. Only God answers the question: "Why is there something instead of nothing?"
PROVE GOD'S EXISTENCE FROM PURE LOGICAL REASONING
Things exist â€" a self-evident truth. A thing cannot cause its own existence because it would have to exist prior to its existence, which is a contradiction. So, a thing either has to be contingent, receiving existence from something else; or necessary, which means that it must be existence. A contingent being cannot cause the existence of something else since it has only received existence. The only explanation for contingent beings is a necessary being. The necessary being is given the name God.
GIVE ME A PROOF FOR THE EXISTENCE OF GOD THAT'S NOT TECHNICAL
"If I find in myself a desire which no experience in this world can satisfy, the most probable explanation is that I was made for another world" (C.S. Lewis). Lewis said that there are no hungers in human existence that cannot be satisfied. If you are thirsty, you can quench your thirst. If you are hungry you can eat. We're born and live with one more hunger and desire â€" the desire to exist forever and to be whole and completely at peace forever. It doesn't seem that any other hunger is impossible to satisfy. So, it is not unreasonable to believe that our greatest longing (eternal happiness) would also be satisfied. All ancient civilisations, all nomadic tribes, all primitive peoples, all peoples from all over the world have been religious in some sense. They all perceive a need for God even if they don't call their transcendental need by that name. And so, just as stomachs exist for food, so God must exist for mankind.
HOW CAN WE BE SURE WHICH GOD IS THE TRUE GOD?
God can't be everything people say about Him because a lot of those things are contradictory. A lot of people are simply wrong in what they say about God. God either exists or He doesn't. And, if He exists, He must be the one same God for everyone whether everyone believes in that one same reality or not. So, how do we know the truth about God? Reason can take us only so far. Revelation does the rest â€" God has told us about Himself. That's why Jesus is called the Word in John's Gospel. He's God, directly expressing Himself to us. Jesus left us His Church. Jesus' Church is the Catholic Church. His Church has taught free from error in matters of faith and morals. No study of Church history has ever disproved the infallibility of the Teaching Authority of Christ's Church. His Church put the Bible together. The Bible is worthy of belief. No studies from ancient history and archeology have ever disproved the authenticity of the Bible. The God of the Church and the Bible is the one God of the Holy Trinity â€" Father, Son and Holy Spirit.
[Welborn. A., Prove it! God, 2000; Carroll, A., Following Christ in the World, 1996; Radio Replies, vol. II]
* Please note that this text should be read in the context of the whole work and in recognition of the appropriate paragraphs of the Catechism of the Catholic Church highlighted in the index.