One problem is the question of God and faith is sometimes not addressed properly. People, even some Christian people, equate faith with believing in the existence of God, tell the atheist God is just a matter of faith. This isn't much of a testimony. This is not the essence of faith! Sure, one must first believe He exists, but God didn't ever lay on us the expectation of blind faith. Jesus Christ proved Himself to the apostles and people of His day. Were overwhelming evidence not in the Bible, I'd have never believed: I'm not one and have never been one to believe some novel. Reading the New Testament and seeing it true brought me to a confrontation with the Lord, and simply a love of Jesus Christ for His truth. Since then, the proof is there.
To the Christian, faith is beyond existential matters, rather involves love and trust in God, a reverence of God, believing in the worthiness of God, and a faith that absolutely knows: we experience the Holy Spirit working in our lives, even. But God left much proof in the Bible, and the atheist (please, I'm not being mean, at all, just telling it like it is) is being pigheaded to not recognize fulfilled prophecy and the statistical impossibility prophetic fulfillments we already know of, such as the first coming of our Lord Jesus recorded in the Old Testament, that it's not possible the prophecies are due to random chance. God said it outright, that He shows His power in prophecy impossible to man,
Isaiah 46:9-10 Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me, declaring the end from the beginning, and from ancient times the things that are not yet done, saying, My counsel shall stand, and I will do all my pleasure.
I can state these things which are true, and still, in my experience, the atheist will not respond, as if standing before a forest and claiming there are no trees.
It's long been my belief that most atheism is a rejection of God, that denying His existence is really a refusal to want to know Him for vanity, as only a real dummy could not understand fulfilled prophecy as proof when this is presented. It's more a matter, "I don't want to believe." (John 3:19-21) Rebellion or some real idiocy, not much in-between.
Here's your proof, which I've posted many times, yet the atheist is still, duh! (Interesting that most atheists refuse to even study the evidence. I can't count the times I've been responded to over the proof in such links in a few minutes, with knee jerk denial, when it would take some study to actually evaluate the information: they won't do it.)
Fulfilled Prophecy as Evidence
Prophecies of the Old Testament Fulfilled in Jesus Christ (This link is sometimes slow.)
And this is only one front of the available proof, prophecy the most dramatic and undeniable, but there's a larger case.