One of the first recorded apatheists was arguably Denis Diderot (1713–1784), who wrote: "It is very important not to mistake hemlock for parsley; but not at all so to believe or not in God."
[3] Apatheism was first coined by Canadian sociologist Stuart Johnson in his study of indifference to religion amid secularization published in 1972.
[4] Apatheism considers the question of the existence or nonexistence of deities to be fundamentally irrelevant in every way that matters.
A person can be a theist, while at the same time have an attitude of apatheism (such beliefs are common in deism) or zeal toward questions of existence, loyalty, or involvement of deity.
[3] Apatheists may feel that even if there are gods/deities and the existence and legitimacy of them were proven, it would not make a difference to them for one reason or another; therefore, which one(s), if any, are real does not matter and any discussion about it is meaningless.