If Christians were serious about educating people in the faith, they would run seminars, and they would have readings with the seminars.
The Australian Christian Lobby has a commendable program 'GPS'. I don't know if it comes with pre-readings or even readings to accompany each seminar, but either way, if I was running it, my pre-readings list would be this:
Greg Koukl's trilogy: Story of Reality, Relativism, and Tactics (in that order).
Francis Schaeffer's trilogy: The God Who Is There, He is There and Is Not Silent, and Escape from Reason.
Olsen, the Mosaic of Christian Belief.
Moreland and Craig: Philosophical Foundations of a Christian Worldview
Geisler: Christian Apologetics
Mittelberg: The Questions Christians Hope No One Will Ask.