Almost there ; but not quite .Secularism is not irreligion. It is not throwing away holy books.
Secularism means to disable those who want to oppress and use force in the name of religion.
Secularism is the principle of seeking to conduct human affairs based on naturalistic considerations, uninvolved with religion hence segregating matters of religion from matters of state.
Secularism safeguards freedom of religion or belief and ensures that the government does not favour any particular religion or impose religion on its citizens.