The Iglesia Ni Cristo believes that the dead will be resurrected. Christ would not have been resurrected if there were no resurrection of the dead (I Cor. 15:12-13).
The Bible provides at least three ways by which a true messenger of God can be recognized: 1) Through his teaching; 2) whether he has biblical testimony; 3) the works he does/did.
The Iglesia Ni Cristo believes that the dead will be resurrected. Christ would not have been resurrected if there were no resurrection of the dead (I Cor. 15:12-13).