What Abraham was going to physically do with his son had already been done in his heart. So that it was not obedience out of obligation, it was obedience springing forth from a heart bowed to the will of the Great Monarch of heaven. This is because it is possible to obey someone without submitting to them in your heart.
Obedience is an action; submission is an attitude. Tyrants get obedience by force and not by willful submission from the heart. God is no tyrant; He is a kind Lord and gentle King who allows His subjects to draw near to Him and bow to Him in their hearts by choice.
Jesus said,
"These people draw near to Me with their mouth, And honor Me with their lips, But their heart is far from Me. And in vain they worship Me” (Matthew 15:8-9, NKJV)
Bowing oneself to God has nothing to do with physical postures or flower declarations; it is a posture of submission humbly taken in the heart in response to the acknowledgement of God being mightier than us. This happens when we see the visions of God’s glory which help give us perspective on the truth that He is not altogether like us (Psalm 50:21).
Every man who has ever seen the visions of God’s glory bowed himself to God. Isaiah bowed (Isaiah 6); Ezekiel bowed (Ezekiel 1) and Saul of Tarsus bowed (Acts 9), John bowed (Revelation 1) etc.
Worship is therefore obedience to God that stems from unreserved submission to Him.