The Greek church separated from the Latin or Romish church about A. D.1054. It is under the jurisdiction of the patriarchs or bishops of Constantinople, Alexandria, Antioch, and Jerusalem. The Greek or Russian church is very extensive. Its jurisdiction embraces more territory than that of the Roman see. The population of this church is estimated at about forty millions.

The following are some of the chief tenets held by the Greek or Russian church: -- They disown the authority of the pope, and deny that the church of Rome is the true catholic church. They do not baptize their children till they are three, four, five, six, ten, nay, sometimes eighteen years of age: baptism is performed by trine immersion. They insist that the sacrament of the Lord's supper ought to be administered in both kinds, and they give the sacrament to children immediately after baptism. They grant no indulgences, nor do they lay any claim to the character of infallibility, like the church of Rome. They deny that there is any such place as purgatory; notwithstanding, they pray for the dead, that God would have mercy on them at the general judgment. They practise the invocation of saints; though, they say, they do not invoke them as deities, but as intercessors with God. They exclude confirmation, extreme unction, and matrimony out of the seven sacraments. They deny auricular confession to be a divine precept, and say it is only a positive injunction of the church. They pay no religious homage to the eucharist. They administer the communion in both kinds to the laity, both in sickness and in health, though they have never applied themselves to their confessors, because they are persuaded that a lively faith is all which is requisite for the worthy receiving of the Lord's supper. They maintain that the Holy Ghost proceeds only from the Father, and not from the Son. They believe in predestination. They admit of no images in relief or embossed work, but use paintings and sculptures in copper or silver. They approve of the marriage of priests, provided they enter into that state before their admission into holy orders. They condemn all fourth marriages. They observe a number of holy days, and keep four fasts in the year more solemn than the rest, of which the fast in Lent, before Easter, is the chief. They believe the doctrine of consubstantiation, or the union of the body of Christ with the sacramental bread.

The Russians adhere to the doctrine and ceremonies of the Greek church, though they are now independent of the patriarch of Constantinople. The church service is contained in twenty-four volumes, folio, in the Sclavonian language, which is not well understood by the common people.