The Absurdity of Idolatry Psalm 90 (LD 34; BC 1)

As Christians we can think that idolatry is only conducting baal worship or something that is forbidden in the Old Testament.  We can think that we do not worship baal or the golden calf so we are free from this sin.  The reality is that we are tempted to trust in many things to sustain us apart from the Lord.  Why is it so absurd to trust in something other than the Lord?