Don’t let Soliton throw you; Asimov was an anti-Christian bigot and his books (I read many as a teen-ager) reflect his ignorant prejudices against the Bible and Christianity. They are worth reading mainly as a study into the minds of secular humanists.
I have an eclectic mix of suggestions - Chesterton and Lewis, as others have said, are worth reading, and Bunyan’s works (not just PP) are always enjoyable lighter reading. I haven’t ready Randy Alcorn (yet, someone gave me a copy of one of his books recently), but John MacArthur has also written a study on heaven that, as someone mentioned, is a worthy topic of study. For apologetics, look up the works of Jonathan Sarfati, Leonard Brand, Cornelius Van Til and Greg Bahnsen, not to mention Josh McDowell.
Dave Noebel’s work on worldviews (Understand the Times) is another must-read, as are the works of Francis Schaeffer. John Foxe’s Book of Martyrs (or better yet, Vol. I and II of Jesus Freaks by DC Talk - seriously) should also be read by Christians generally. And on the subject of persecution, Richard Wurmbrand’s autobiographical book Tortured for Christ is a classic (you might even be able to get it free from Voice of the Martyrs at Persecution.com).
On social issues, Marvin Olasky is a favorite of mine, but I hesitate to recommend more without knowing what your specific interests may be. There is a lot of great Christian literature out there, but it tends not to be found unless you make an effort to look for it (Satan/the world aren’t exactly in the business of promoting God’s perspective, ya know?)
God bless,
Eric
Asimov was an anti-Christian bigot and his books (I read many as a teen-ager) reflect his ignorant prejudices against the Bible and Christianity.
Not even a good Jew -- he was an "Ethical Humanist", or somesuch (and, I have read, at the end did not face death well).
Asimov wasn’t so much a bigot as he was an outspoken Atheist.