Orthodox and Christians do not consider themselves heretics reciprocally, but a schism. They both have a valid apostolic succession, meaning a lineage of bishops tracing themselves back to the very apostles, followers of Christ, which guarantees sacramental validity. Furthermore Orthodox and Catholics share all the 7 sacraments with the same theological meaning. In comparison Latter-Day Saints also share the 7 sacraments, but they do not have the same theological meaning. "The Orthodox and Catholic Churches are like two lungs of one body... Protestantism is a new organism, born of Western individualism." -John Meyendorff

— China when you ask them to do literally anything for Palestine