What is the reason for worshipping a god other than God?

(Question from a 7th grade student.)  It’s clear that sometimes the people think they ARE worshipping God.  I think of the Pharisees challenging Jesus- they believe they are being faithful to God. Other times, people just forget about God because they don’t have an immediate need- it is easy to get distracted by all the noise around us.  Finally, following God is hard work.  It takes intention and coming outside of our comfort zone in order to join God’s work.  Jesus made this clear when He called the disciples out of their boats and throughout His ministry to see and care for those in need.