What are we to make of election, falling away, and church membership? It is clear from the history of redemption that there have been unbelievers among the congregation of God’s people, and Scripture makes it clear there always will be (Mathew 13:24-30, 36-43). What are we to make of this? Is it our job to discern who in the church is really saved?
In commenting on 1 Peter 1:1-2—elect according to the foreknowledge of God the Father—John Calvin writes, “…we are not curiously to inquire about the election of our brethren, but ought on the contrary to regard their calling, so that all who are admitted by faith into the church, are to be counted as the elect; for God thus separates them for the world, which is a sign of election.”
A few hundred years later, Herman Bavinck penned similar sentiments, “Certainly, there are bad branches on the vine, and there is chaff among the wheat; and in a large house, there are vessels of gold as well as vessels of earthenware (Matt. 3:12; 13:29; John 15:2; 2 Tim. 2:20). But we do not have the right and the power to separate the two: in the day of the harvest, God himself will do this. As long as—in the judgment of love—they walk in the way of the covenant, they are to be regarded and treated as allies. Though not of the covenant, they are in the covenant and will one day be judged accordingly.” (Reformed Dogmatics III, p. 232)
No one is perfect. Even saints sin. Do not judge people according to where you are in your spiritual walk; or where you think they should be in theirs. Is a person faithful to attend the assembly of believers on the Lord’s Day? Does he evidence a desire, however small, for spiritual things and growth in the Lord? Count him as a brother. Christ knows all those that are his and will not lose one of them. You are not privileged with such knowledge or ability.