In which of the following clusters, all the words mean 'lgnoring existence of God'
Pantheism, Agnosticism. Secularism
Atheism, Agnosticism, Secularism
Deism, Secularism, Agnosticism
Atheism, Deism, Secularism
Atheism (disbelief in the existence of God or gods), Agnosticism (view that the existence of God or the supernatural is unknown) and Secularism (system rejecting all forms of religious faith) all mean ignoring existence of god. Deism means belief in the existence of a supreme being. Pantheism means the belief that God, or a group of gods, is identical with the whole natural world.
So, Atheism, Agnosticism, Secularism is the correct option.