How to know when something good has become an idol...
Examine your thoughts - What do you daydream about? When your mind wanders, where does it go? Does Christ or something else get more of your thoughts?
Examine your attention - What distracts you from spiritual disciplines like Bible reading and prayer? What activity would you rather be doing instead?
Examine your finances - Most of us have some level of discretionary income, money left after bills have been paid. How do you spend your disposable income?
Examine your relationships – What person do you most want to please? Do you have friendships or romantic attachments that lead you away from God?
Examine your concerns – What do you worry about? What do you most fear losing?