Most confuse agreement with submission. But submission is not needed until you disagree.
It's easy to follow God when you agree. But how about when it goes against what you want to do, or what you think is best?
That's when submission comes into play. You choose to sacrifice your own wisdom to pick up God's wisdom.
His ways are not our ways. If you have to agree to obey, enjoy being bullied by the devil.
You cannot resist the devil without first submitting to God.