God’s Teachings that are brought to us by His Manifestations (Prophets) are intended for the whole humanity

The summons and the message which We gave were never intended to reach or to benefit one land or one people only. Mankind in its entirety must firmly adhere to whatsoever hath been revealed and vouchsafed unto it. (Baha'u'llah, Gleanings from the Writings of Baha'u'llah)