Does it matter? Yes it does.

 Read 1 Kings 13. 

We all do not worship the same God.  So, what does the LORD, creator of heaven and earth, think of made-up religion? 

Jeroboam, the king of northern ten tribes of Israel, decided to make up his own worship and build his own altars.  This was done to prevent the people from traveling to Jerusalem in the southern kingdom to worship.  He did not have to wait long to discover what God thought his false religion.  God sent an unnamed prophet from Judah to deliver His message. 

The king's attempt to stop the prophet resulted in a temporary physical deformity and his altar destroyed.  When Jeroboam saw the power of God, he asked for prayer.  Note that he did not ask for forgiveness of his sin, nor to lead the people in a right way, but only for his hand to be restored.  Jeroboam continued in his sinful religion, practicing a pretense of worship on his own terms (vv.33-34).  The worship on a mountain in Samaria prompted the discussion centuries later with Jesus in John 4. 

When God is at work in one life, He is simultaneously at work in all the lives around that person.  The prophet was given strict and specific orders.  He had been given a mission with a message.  He delivered the message but failed to obey the mission.  Who would ever want this on their tombstone: "It is the man of God who disobeyed the word of the LORD" (v.26a)? 

Jeroboam thought he could just do something religious and please God.  The prophet partially obeyed but allowed himself to be influenced by a lying man claiming to have an overriding word from the Lord.  Both were tragically wrong.  If these men had taken the truth of God’s word seriously and fully obeyed, their lives and memorials would have been far different. 

Jesus said, "But the hour is coming, and is now here, when the true worshipers will worship the Father in spirit and truth, for the Father is seeking such people to worship him." (John 4:23)