If Jesus knows everything then why does he not part the crowd for the paralysed man?

Good question!  In Luke 5 the friends of a paralysed man lower him through the roof to Jesus, because they can’t get any close due to the crowd.  Luke tells us in this episode that Jesus sees their faith and this is part of his reason for healing the man.  Perhaps Jesus wanted to give the men a chance to demonstrate their faith and so waits for them to bring them man to him, even with the extra difficulty.  Faith is not simply knowing something in your head, but knowing something, and being convinced enough about it to live in the light of that.  Acting on what you know is faith. So Jesus waits until these men act on what they know about Jesus, so they can demonstrate that their faith is real.