To Man not being able to overcome his sin nature to bow down to the Creator of the Universe.
I ~think~ the point is by "nature" man does not want to bow down to the True Holy God of creation..but they chose to make gods they are comfotable kneeling before..
Did you see The Gladiator? ..I watched as he handled his little gods..it was a very telling moment to me (pre calvinist days) that a man could worship there little things..may I give a brief example of what happens when a carnal man first sees the Holiness and power of God?
Luk 5:8 When Simon Peter saw [it], he fell down at Jesus' knees, saying, Depart from me; for I am a sinful man, O Lord.
THAT is our inital human instinct..we want (like Adam and Eve) to run and hide so we do not have to look at ourselves in HIS light..
The problem is not getting men to kneel before a god..the issue is can the grace of God overcome our natural response to make us desire to kneel before the One true holy God of creation...and not run away to hide behing the leaves?