I don't have to prove anything to you. You have the bigger problem - when you meet God one day and you have to explain yourself to Him. I don't have that problem.
That mind of yours – your soul – is going to live forever. You have a God-given conscience – you know the difference between right and wrong. Is murder wrong? Is rape wrong? Is molesting children wrong? If all you are is a clod of molecules in motion, then there is no morality. Murder is just one clod colliding with another. You know better! In atheism there is no hope, no meaning, and rational thought is impossible. Think!
Are YOU ready for justice? How many lies have you told? Ever stolen anything, including time from your employer for which you got paid anyway? Ever lusted? Ever gotten angry or insulted anyone? God knows your every thought and judges you as a lying thief with an adulterous and murderous heart. This also applies if you’re religious. Rituals and church attendance don’t save.
If there is no God and matter is everything, then WHO are YOU? Is your next thought just brain chemistry? Is there any difference between YOU and a rock on the ground, other than the arrangement of atoms? Do you believe in the existence and the importance of truth, logic, beauty, love, justice, honesty, and goodness? Matter doesn’t have these properties. Don’t YOU have the capacity to distinguish between good ideas and bad ideas, logic and illogic, right and wrong? Isn’t there a YOU in there? Everything about YOU tells YOU that YOU exist! Once YOU admit that YOU exist, it’s easy to figure out that God exists.