In the Bible we see idolatry in the form of other gods or other religions. So, maybe we think that we’re easily obeying that first commandment (“You shall have no other gods before me” Exodus 20:3). However, idolatry is much more than choosing to follow another religion or god. To love God and therefore obey him is to recognize how we disrespect him by replacing him with anything or anyone else.
We’re wired for worship. More specifically, we’re wired to worship the God who created us. When we choose not to worship God, by default, we worship a cheap substitute. We are looking to someone or something to do for us what only God can truly do for us. The Bible calls this idolatry.
Quoted from: Are You Settling for Less?