We are simple human, limited in what we can do, while the Lord God is boundless in what he can do and is so high above us that his infinity and greatness are beyond our comprehension. To think that we know so much that we don't need him anymore is sheer folly! Do you keep your own heart beating and your own lungs pumping? If you think so, then how come you have absolutely no control over them?
If a human friend donates an organ to save your life, you would feel grateful and treat the donor as one of your best friends. Now God has donated his own life so that you may live for all eternity! Shouldn't you at the very least treat him as a friend too?
Our God is completely approachable. Whatever barrier there is between him and you is set up by you, not him. He has so made us that we can never be truly happy until we find and rest in him. He has really given us all he can possibly give us, and is ready to enter union with us. This is our most lovable Lord.