“Employment”, except as provided by Section 634.5, includes service excluded from “employment” under the Federal Unemployment Tax Act solely by reason of paragraph (8) of Section 3306(c) of that act because it is service performed in the employ of a religious, charitable, educational, or other nonprofit organization described in Section 501(c)(3) of the Internal Revenue Code of 1954 which is exempt from income tax under Section 501(a) of that code.