The only way to answer this question, of course, is to find evidence. It certainly is reasonable to suggest that if there is a God, he would make available to us evidence adequate to the task of proving his existence. But does such evidence exist?
Archaeological findings continue to confirm rather than refute the accuracy of the Bible. For example, an archaeological find in northern Israel in August 1993 confirmed the existence of King David, author of many of the Psalms in the Bible. The Dead Sea Scrolls and other archaeological discoveries continue to substantiate the historical accuracy of the Bible.
The Bible was written over a 1500-year span, in different locations and on separate continents, written in three different languages, covering diverse subject matters at different points in history. Yet there is an astounding consistency in its message. Throughout the entire Bible the same message appears:
1. God created the world we live in, and created us specifically to have a relationship with Him.
2. He deeply loves us.
3. He is holy and therefore cannot be in relationship with sinful people.
4. God provided a way for our sins to be forgiven.
5. He asks us to receive His forgiveness and have a relationship with Him that will last eternally.
6. Along with this central script, the Bible specifically reveals God's character. Psalm 145 is a typical summary of God's personality, thoughts and feelings toward us.
6. Unlike any other revelation of God, Jesus Christ is the clearest, most specific picture of God.
Many people do not believe in God and they most probably have their reasons and they will most probably stick to their theory of evolution, they will not change their minds. It is like if someone refuses to believe that people have walked on the moon, then no amount of information is going to change their thinking. Satellite footage of astronauts walking on the moon, interviews with the astronauts, moon rocks...all the evidence would be worthless, because the person has already concluded that people cannot go to the moon.
We purely get our evidence from The Bible. The Bible is all the evidence Christians need to believe but other people may believe in other Gods and may have their own evidence to believe from.
I believe in God and have evidence from The Bible but others have their own faiths to believe from, we have a lot of evidence to state that Jesus exists and that is why I believe.