child_secret_faith_conversion_success_effect

child_secret_faith_conversion_success_effect = {
	scope:child = {
		make_character_crypto_religionist_effect = {
			CRYPTO_RELIGION = scope:guardian.secret_faith
		}
	}
	# Notify the actor
	scope:guardian = {
		send_interface_message = {
			type = event_religious_good
			title = secret_faith.1001.message
			left_icon = scope:child
			scope:child = {
				random_secret = {
					type = secret_crypto_religionist
					limit = {
						NOT = { is_known_by = scope:guardian }
					}
					reveal_to = scope:guardian
				}
				add_opinion = {
					target = PREV
					modifier = impressed_opinion
					opinion = 20
				}
			}
			random_secret = {
				type = secret_crypto_religionist
				limit = {
					NOT = { is_known_by = scope:child }
				}
				reveal_to = scope:child
			}
			# Only playable characters have spiritual fulfillment
			if = {
				limit = { is_playable_character = yes }
				change_spiritual_fulfillment = minor_spiritual_fulfillment_value
			}
		}
	}
}

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