Genuine Christianity Tested by Obedience

The book of 1 John shows us that the difference between the lost and saved man is so clear that it is discernible and recognizable. John asserts that rather than it being vague, it is something that is evident when he writes verses like, "Whoever says 'I know Him' but does not keep his commandments is a liar, and the truth is not in him..." - 1 John 2:4.