I think it is dawning on many people that evangelical Christianity has shallowed out over the past generation or two. I will be so bold as to suggest some causes which are not often mentioned by others.
Children’s Bible story books: Parents have felt inadequate to help their children understand what the Bible is all about, and these attractive, nicely illustrated books have seemed like a godsend. But are they? The writers pick some of the more dramatic accounts in the Bible and attempt to weave a stand alone moral teaching into each story. This requires the insertion of editorial comments that may miss the relationship of the event recorded in the Bible to the unfolding of God’s plan of salvation. The writer’s comments are well-intended, but sometimes presume an ability to read God’s mind to draw conclusions that are not even hinted at in the Bible.
Study Bibles: People feel intimidated at trying to study and understand the Bible, so many turn to reference Bibles that promise to aid them in their study of the Bible. The problem is that these study Bibles really become a substitute for personal Bible study. The point of view of the compiler of the study Bible is not blatantly displayed, yet it affects how they see the relationship of one passage of the Bible to others. Their point of view leads them to link passages that really have no connection to each other, to miss other links, and to use one passage as the key to understanding other similar passages that really say something quite different. It is would be better to trust the Bible to interpret itself and not separate verses from their context.
The desire for Christian unity: The desire is good, but the approach leads to downplaying denominational differences in doctrine and practice. I think most of us will admit that not all the differences were inspired by God, but to just abandon them has in many cases led to abandoning clear Scriptural teachings. True spiritual unity cannot be achieved by a spirit of compromise, but only by obedience to the Word of God and the Holy Spirit. The “unity of the Spirit in the bond of peace” is not the same thing as deciding to make nice to each other in public.
The remedy to all of these things is to become like the Bereans and search the Scriptures daily and to obey its teachings.