Islam is like a big beautiful tree. Its Pillars make up the roots and the branches.

The roots of the tree: Called Usool al-Deen. These are the BELIEFS a person must have to be a Muslim. Just like a plant, only when the roots are there can the tree grow and make branches!
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It is important that a person believes in the Usool al-Deen after thinking about them deeply. It is not enough to believe in them just because we are told to.

The branches of the tree: Called Furoo al Deen. These are mainly actions which Muslims must make. Just like in a tree, the branches can only grow when the roots are firm!

So therefore Islam is made up of BELIEFS and ACTIONS