Because we’ve heard it all before. Because we’re sick of the pretenses. Because we’re more than just brains. Because we’d like to see faith lived and not just talked about. All this and more…
…but iMonk says it much better than I could. This article is a must-read:
“Just Beyond the 100th Time: What Many Of Us Are Looking For”
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Getting Started 
I agree. The iMonk article is excellent, as are many of the follow-up comments.