unite_africa_decision_effects

unite_africa_decision_effects = {
	#Prestige
	add_prestige = massive_prestige_gain

	#Religion bonuses
	if = {
		limit = {
			faith = {
				OR = {
					religion_tag = islam_religion
					religion_tag = west_african_roog_religion
					religion_tag = west_african_religion
					religion_tag = west_african_bori_religion
					this = faith:miaphysitism

				}
			}
		}
		add_piety = massive_piety_gain
		faith = {
			change_fervor = {
				value = medium_fervor_gain
				desc = fervor_gain_united_africa
			}
		}

		if = {
			limit = {
				any_vassal_or_below = {
					rite != scope:africa_uniter.rite
					is_ai = yes
					capital_province ?= { geographical_region = world_africa }
				}
			}
			every_vassal_or_below = {
				custom = every_non_root_faith_vassal_africa
				limit = {
					rite != scope:africa_uniter.rite
					is_ai = yes
					capital_province ?= { geographical_region = world_africa }
				}
				random = {
					chance = 33
					set_character_rite = scope:africa_uniter.rite
				}
			}
		}

		if = {
			limit = {
				any_realm_province = {
					rite != scope:africa_uniter.rite
					geographical_region = world_africa
				}
			}
			every_realm_province = {
				limit = {
					rite != scope:africa_uniter.rite
					geographical_region = world_africa
				}
				county = { add_to_list = every_realm_county }
			}

			every_in_list = {
				list = every_realm_county
				custom = every_non_root_faith_county_africa
				random = {
					chance = 33
					custom_tooltip = every_non_africa_uniter_faith_convert
					hidden_effect = { set_county_rite = scope:africa_uniter.rite }
				}
			}
		}
	}
}

As written in game/common/scripted_effects/00_decisions_effects.txt.