Greg Koukl has a helpful post on this question:
“Some say Christianity is just a crutch. But let’s turn the question on its edge for a moment. Is atheism an emotional crutch, wishful thinking? The ax cuts both ways.
Perhaps atheists are rejecting God because they’ve had a bad relationship with their father. Instead of inventing God, have atheists invented non-God? Have they invented atheism to escape some of the frightening implications of God’s existence? Think about it.
And to the question “Is Christianity a crutch?” I say yes, but not in the way the atheist puts the challenge. Just as someone with a broken leg needs a crutch to lean on to help him heal, Christians have recognized that we are broken people who need a Savior who is the only Healer of our sin.
We all need a crutch. The questions is, are you using a crutch that will hold you?….”