GOD KNOW ALL: why need to pray? why need for church? why need to worship? god made universe?

you know everyone is going to die. you know everyone will face difficulties. Knowing fully we are all going to die, do we sit calm? we earn, we enjoy, we save people. If problem comes, are we idle? we face it to succeed. so, God knows all is true including future etc.,but we pray to remind him, we go to church, worship to identify that we are the creations of Him.