Paganism, Folk religion, & Ethnic/indigenous religion
To me, paganism roughly emergence around 13,000 years ago with the agricultural explosion in turkey “Anatolia” and the connected areas such as in the lavant (described as the “crossroads of western Asia, the eastern Mediterranean, and northeast Africa”, and the “northwest of the Arabian plate” including Cyprus, Israel, Iraq, Jordan, Lebanon, Palestine, Syria and Turkey). Turkey is a nation straddling eastern Europe and western Asia with cultural connections to ancient Greek, Persian, Roman, Byzantine and Ottoman empires. Paganism is part of a linked group of religious thinking seeming to turn the once believed animistic spirits” (a belief system dating back at least 100,000 years ago on the continent of Africa), that in totemism (dating back at least 50,000 years ago on the continent of Europe) with newly perceived needs where given artistic expression of animistic spirits both animal or human “seemingly focused on female humans to begin with and only much much later is there what look like could be added male focus”, but even this evolved into a believed stronger communion with more connections in shamanism (a belief system dating back at least 30,000 years ago on the continent of Aisa) with newly perceived needs, then this also evolved into Paganism (a belief system dating back at least 13,000 years ago on the continent of eastern Europe/western Asia turkey mainly but eastern Mediterranean lavant as well to some extent or another) with newly perceived needs where you see the emergence of animal gods and female goddesses around into more formalized animal gods and female goddesses and only after 7,000 to 6,000 do male gods emerge one showing its link in the evolution of religion and the other more on it as a historical religion.
Paganism: broadly defined as anyone involved in any religion other than one of the main world religions.
Folk religion: broadly defined as anyone involved in any religion deemed distinct from the official doctrines and practices of organized religion.
Ethnic/indigenous religion: broadly defined as anyone involved in any religion deemed “primal religion,” “primitive religion,” and “tribal religion” so it is overlapping with “folk religion” but particular in relationship to an ethnic group, thus speak of Chinese and African indigenous religions, but can also refer to popular institutionalized religions, such as Hinduism of the Indians, Judaism of the Jews, Shenism of the Han Chinese, and Shinto of the Japanese.
Finally, paganism also overlaps with “folk religion” as well as “Ethnic/indigenous religion” and can express a worldview that is animistic, totemistic, shamanistic, pantheistic, deistic, deityistic, monotheistic, duotheistic, polytheistic, or monotheistic persuasions. Paganism originally meant “rustic, rural, country dweller ” a traditional class of herders/farmers/laborers or “nonparticipant, civilian” later referring to anyone involved in any religion other than one of the main world religions, specifically non-christian. Thus, paganism and folk religion are relatively the same things to me, just different words meaning relatively the same things so I just use the term paganism.

Animism, Totemism, Shamanism, and Paganism

Here are the religious terms defined:
Animism: the belief that natural objects and phenomena and the universe itself possess souls and consciousness or the belief in spiritual beings or agencies.
Bitheism: a belief in two gods (brothers/ father son) or two goddesses (sisters/ mother daughter).
Deism: god created the universe and started it functioning, but is no longer actively involved in it.
Deityism: is acceptance or belief in the existence or possible existence of deities or supernatural nonhuman beings. This can entail belief in existence of a god, gods, or supernatural beings without personal worship of them or even thinking it or they do not deserve honor or following, such as seen in some forms of buddhism.
Ditheism: the belief or doctrine that there are two gods of equal power, possibly two antagonistic deities one a force for good and the other a force for evil.
Duotheism: belief in the existence of precisely two deities usually framed as a god and goddess possibly a divine couple.
Henotheism: belief in a single god while accepting the existence or possible existence of other deities or a main deity accompanied by many subservient lesser deities.
Herotheism: is a belief system which posits worship of a mortal human into deified heroes (a type of ancestor worship or early god creation often from a high regarded or high status person like a king made god.
Monotheism: belief in a single, usually male, deity.
Pantheism: is a belief which holds that the divine is synonymous with the universe, but it exists beyond the universe as well or god not a being but is the inner spiritual essence of everything in the universe.
Polytheism: belief in a pantheon of many deities and is usually male and female.
Tritheism: a belief in three gods such as a christian heresy holding that the Trinity consists of three distinct gods.
Zemiism: spirits or supernatural beings often dwelling in objects.
Zoomorphism: the attribution of animal form or nature to a deity.
References: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14