Atheism versus Christianity

A question about Atheism versus Christianity. In order to ask the question I must first define Atheism and Christianity. Definition of Atheism: 1. the doctrine or belief that there is no God. 2. disbelief in the existence of a supreme being or beings. Definition of Christianity: 1. a monotheistic system of beliefs and practices based on the Old Testament and the teachings of Jesus as embodied in the New Testament and emphasizing the role of Jesus as savior. Now both of these definitions contain the term belief (something believed; an opinion or conviction confidence in the truth or existence of something not immediately susceptible to rigorous proof: a statement unworthy of belief, confidence; faith; trust). Here is the question; how can anyone prove the existence of God or disprove the existence of God? It is faith either way. Atheist try to disprove the unprovable through their belief and True Christians just believe that God does exist. Hebrews 11:6 And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him. If Atheist believe God does not exist, why try to disprove His existence? If Christians believe God does exist, why try and prove His existence? It is based upon faith! A known Atheist once made this statement about Christianity; “If Christians truly believe that there is a God and the consequence for not putting faith in Him(Jesus Christ) will lead you to Hell, it is Immoral for Christians not to Evangelize the World!” Still the question is how can an Atheist attack something they say does not exist? Does not a person have to believe, either for or against, in order to have a belief or faith? Just something to think about.