Atheism and skepticism have nothing to offer when it comes to evidence, but they do have plenty to say contra theism and the Christian worldview. In fact, skeptics can't say anything of note, so why should they be taken seriously? Skepticism is self defeating as a worldview, because the battle cry of skepticism (It is true that we need to be skeptical) espouses nothing more than relativism.
What about atheism? Again atheism offers no positive reasons why one should believe in the non-existence of God. Atheistic arguments always seem to take the negative view against theism or Christianity. About the only argument that atheism has is the argument from evil, but even this argument fails to show the non-existence of God, because recognizing evil means there must be a moral law. Evil points out that this world is not the way it is suppose to be. The most damaging part of the argument from evil is how to reconcile evil with an all-powerful and omni-benevolent God, but again this does not show that God does not exist.
What about the Christian worldview, does it offer positive evidence for its view? On the Christian world view a positive cumulative case can be made for the existence of God and the truthfulness of Christianity. Various arguments concerning the existence of God can be given such as: the Kalam cosmological argument, the design arguments (moral, mind, biological, astronomical), and revelation. All of these arguments placed together are pieces of a puzzle that reveal a positive case for God's existence. The late Anthony Flew stated that the cumulative argument can't be sustained if one of the arguments is flawed. He compared the cumulative approach to a leaky bucket; all you need is one leak to drain the bucket. However, it was a design argument (DNA information) that convinced Flew to change from atheism to theism. The cumulative approach brings many arguments together that support one another in order to show that theism is the most rational approach.
Like the cumulative approach for theism, the historicity of the Christian worldview offers cumulative evidence to show it is the most logical view. The cumulative evidence of Christianity rests on the person of Jesus. As Paul stated in his letter to the Corinthians, " If Christ has not been raised, our preaching is useless and so is your faith. More than that, we are then found to be false witnesses about God (1 Cor. 15:14-15)." The evidence rests primarily on the person of Jesus and his resurrection, which includes: prophesy, secular writings along with the gospel narratives, the empty tomb, the women as the first witnesses of Jesus, the resurrection occurring in Jerusalem, the post-mortem appearances, and the changed lives of the disciples.
Atheism and skepticism can present no positive case for their worldview, only the negative tearing away at theism or Christianity. Part of the problem with these worldviews is that they rely too heavily upon a Humeian system of proof. The late atheist, David Hume, set the bar way to high for anything that could even be considered as truth. In fact, his own standard of absolute, 100% proof, can not be sustained to show that his view of what should count for truth should be accepted. Much like David Hume's reasoning, atheism and skepticism attacks theism and Christianity in such a way they do not have to justify.
Atheism and skepticism are forced to take the negative view, because meaninglessness is ultimately what they are arguing for. As C.S. Lewis rightly pointed out, "Atheism turn out to be too simple. If the whole universe has no meaning, we should never have found out that it has no meaning." Taking the negative view does nothing to advance one's cause, and yet, this is exactly the approach of both the atheist and skeptic.
 Lewis, C.S., Mere Christianity, p. 46
- For a detailed article on "Hume and a cumulative case argument", by Doug Geivett - click here