I'd like to think of myself as above moderately educated, but I will take a crack at it anyway. I believe in God because:
1. The words of Scripture. I know this doesn't mean much to an unbeliever, but to me, it is the most important. The Bible doesn't set out to prove His existence, it presupposes it. It assumes God exists and that it isn't even debatable.
2. The complexity of the universe. Take the earth itself.
"The Earth...its size is perfect. The Earth's size and corresponding gravity holds a thin layer of mostly nitrogen and oxygen gases, only extending about 50 miles above the Earth's surface. If Earth were smaller, an atmosphere would be impossible, like the planet Mercury. If Earth were larger, its atmosphere would contain free hydrogen, like Jupiter.4 Earth is the only known planet equipped with an atmosphere of the right mixture of gases to sustain plant, animal and human life.
existence of God The Earth is located the right distance from the sun. Consider the temperature swings we encounter, roughly -30 degrees to +120 degrees. If the Earth were any further away from the sun, we would all freeze. Any closer and we would burn up. Even a fractional variance in the Earth's position to the sun would make life on Earth impossible. The Earth remains this perfect distance from the sun while it rotates around the sun at a speed of nearly 67,000 mph. It is also rotating on its axis, allowing the entire surface of the Earth to be properly warmed and cooled every day.
And our moon is the perfect size and distance from the Earth for its gravitational pull. The moon creates important ocean tides and movement so ocean waters do not stagnate, and yet it restrains our massive oceans from spilling over across the continents."(1)
3. The complexity of life itself. Take just a DNA molecule. The amount of information can fill libraries. This information determines everything about you. Information cannot come from matter, it can only come from a greater source of information, i.e. God.
4. Mere "chance" is not an adequate explanation of creation.
Imagine looking at Mount Rushmore, in which the likenesses of Washington, Jefferson, Lincoln and Theodore Roosevelt are carved. Could you ever believe that it came about by chance? Given infinite time, wind, rain and chance, it is still hard to believe something like that, tied to history, was randomly formed in the side of a mountain. Common sense tells us that people planned and skillfully carved those figures.
5. The life of Christ. Here was God in the flesh, the real persona of God. Examine His life, death and resurrection.
6. The continuing existence of the Jewish nation. Here is a people who have been persecuted, enslaved and had wars waged on them by some of the greatest, most powerful civilizations in history, the Romans, the Babylonians, the Assyrians, the Third Reich and the collective Arab nations. Yet they have survived while most of these have crumbled to dust.
I could go into much more detail, but space does not permit. I ask you to examine the evidence without prejudice or presuppositions and come to your own conclusions. I think you will see that God is real and active, then come to His Son Jesus.