I know that there are people who find believing in the invisible God difficult and wonder why God does not make himself more obvious to them. Well, God wants you to have faith, because believing in God too easily doesn't take much faith and with weak faith, you won't grow or stick with God long. Let's not forget that God actually came into the world! Jesus was here, performed all kinds of miracles, and rose from the dead himself ~ did all the people then believe in him? Making it easy may even turn people away, for people do not value anything that comes too readily. God is doing just fine.