When Dinesh D’Souza talks about Crayon Christianity he is emphasizing the fact that many Christians have not progressed from the simple teachings of their faith they learned as a child.
D’Souza talks about being able to contend for our faith. We need to equip ourselves with a more adult and complete understanding of our faith so that we will not lose it to those who have enticing other answers. Too many Christians are unprepared for the onslaught of sophisticated Atheism, he preaches.
We need to know about Atheism and what Atheists are saying that has little truth. In short we need to become adults in our religion and to actively pursue a study of it. And to do that we need to get beyond Crayon Christianity and into a mature realization of why we are Christians. If we ae practicing something for which we do not know why, we are mindless robots.
In short we must go BEYOND KNOWLEDGE INTO WISDOM.