In Matthew 7:21-23, the Lord warns there are vast multitudes of church-going people who profess to know Him, but do not savingly know Him. Standing in contrast to the Lord's warning, many churches and pastors show apathy and indifference to this warning as though this does not apply to them or their congregation, and thus, this uncomfortable and unpopular truth is rarely spoken of in the modern church. In this book, we will examine the Lord's warning to the church-going unbeliever, examine the attributes of the church-going unbeliever, provide an analysis for why there are so many church-going unbelievers, and provide a Biblical call to action.