I've run into a growing population of 1. Atheists who believe there is a God, but not necessarily Jesus. 2. Atheists who believe in Jesus, but not God. 3. Agnostic Atheists who believe there is a God, but no specific God, or believe there was a God in time and space, such as the first human or organism, but not God as in the sense we believe in.
I would encourage watching some debates of William Lane Craig vs. Christopher Hitchens, as they exemplify the reason atheistic reasoning is flawed. Atheists use logical reasoning fallacies to sometimes try to debunk Christianity, but forget that they are presupposing many non-evidential theories, and still requiring evidence for believers on things we cannot provide evidence for. For example, atheists presuppose math, logic, and science, even though none of these theories have evidence other than self-evidence, which is usually the same evidence for believers. Craig has a few evidences to support the Bible, but the problem with needing evidence for Jesus as God is that you can't prove something like that until we get to heaven, and if we found Jesus's body, then the Bible wouldn't be true, since he ascended back to heaven. You will find atheists will shoot down all your theories with reasoning, but when confronted with the same reasoning against atheism, it's not fallacious all of a sudden. I try to point out to atheists that the very word "A"-theist means without theism, as in without God, but they have redefined and made so many different groups now that it is hard to define what atheists particularly believe anymore.