Prayer. Thats the ticket, if we ever realize that our prayer life has slipped.... that should be an alarming warning that sin is at the gate in our lives.
Oddly enough, while I live in a rather liberal town, thats helped me grow all the more. I can't deny the spiritual warfare is afoot. When you have professors who are, pardon the literal pun hell-bent, on convincing you of their beliefs of atheism.... what more of a demonstration do we need that only Jesus is the Light?
Look around us, at the campus, and what the secular world and luke-worm christianity has spawned? The world around us, is all that I need to convince me of the "necessity" of our relationship with God.