Do you find it curious that Jesus is asking them if they know Who He is after they have walked with Him and worked with Him for almost three years now?
Further, consider when He asked this probing question. They had recently went out on a mission in His name healing people and driving out demons! The day before they had miraculously fed thousands of people with one simple lunch!
Is it possible to do all those amazing feats and still not know Who Jesus is?
Consider what Jesus said on another occasion:
“Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father who is in heaven. Many will say to me on that day, ‘Lord, Lord, did we not prophesy in your name and in your name drive out demons and in your name perform many miracles?’ Then I will tell them plainly, ‘I never knew you. Away from me, you evildoers!’ Matthew 7:21-23
Chilling isn't it? Jesus makes it plain that you can do amazing things in His name but not necessarily know Him.
Could it be that discipleship is not so much about what you do are as what you are? Could it be that discipleship is about intimately understanding Who Jesus is? It makes sense that there is a difference between knowing Jesus and knowing about Him.
That is a HUGE difference! That is THE difference - relationship vs. religion. Religion is based on the belief that you can "do" and "not do" yourself into believing. But Jesus pokes a whole through that notion! He wants to live in relationship with you and desires to live His life out through you. Your doing for Christ results from being in Christ.
If your focus is on what you do or don't do for Christ, you are not a disciple. Even if you are doing miracles and deliverences. It is about "being" not "doing". True discipleship is knowing Jesus and living in intimate relationship with Him.
Are you in Christ today? Do you know Him? Don't settle for doing.