"And they feared exceedingly, and said one to another, What manner of man is this, that even the wind and the sea obey him?". Mark 4:41
When all is said and done, when we come to the very end, when eternity comes, when we stand in the Judgment, it won't matter if we knew Him, it won't matter how much we think we knew Him, it won't matter how much we knew about Him, it won't matter what we saw Him do and heard preached about Him. The only thing that will matter is whether He knows you are not. You can say you know Him, but does He know you. "And then will I profess unto them, I never knew you: depart from me, ye that work iniquity". (Matthew 7:23)
The disciples asked a good question, but they needed to seek to find out the answer. Once they found the answer (He is the Son of God- the Savior of the world), they then needed to ask another question-- since He is the Son of God, does He know me? You may think you know Him. You may think you know a lot about Him. You may think you know all there is to know about Him. But the most important thing you need to be finding out is-- does He know you?
Have a great day. It isn't whether you know Jesus, it is whether He knows you that matters.