Question: Who are “the called of Jesus Christ”?
Answer: There are two calls, though not the same two calls taught by Calvinism. There is the universal call to live in Christ. Matthew 22:14 states: “For many are called, but few are chosen.” There is also the call to live for Christ, which speaks of the Holy Calling, in terms of the function in which each Christian has been uniquely gifted by the Holy Spirit and predestined by God the Father to perform within the body of Christ. 2nd Timothy 1:9 states: “...who has saved us and called us with a holy calling, not according to our works, but according to His own purpose and grace which was granted us in Christ Jesus from all eternity.” Lest the Calvinists think that this is what they had in the Father, notice that this is what is in Christ. Essential to Calvinism is a notion of two Elections, a primary election in the Father, by sovereign grace, and a secondary election in Christ, by faith. However, the Calvinist’s ‘primary election’ never happened, and couldn’t happen, because apart from the basis of being in Christ, we would have no standing with the Father. Jesus states: “I am the way, and the truth, and the life; no one comes to the Father but through Me.” (John 14:6) The fact that we have our calling in Christ from all eternity, speaks to the fact that having been foreknown in Christ (Romans 8:29), God has an eternal plan for each Christian. Paul referred to Christians as “the called” in order to emphasize this fact, that is, that each Christian has a unique calling and a unique election, according to the unique gift of the Holy Spirit bestowed upon each believer in Christ for the evangelization of the lost world, and for the edification and growth of the body of Christ. (What is amazing to me is that every time the Calvinist reads the word "foreknowledge," they see "foreordination." As to the answer of why, refer to the discussion below on The Glasses of a Calvinist. The glasses of Determinism dictates that foreknowledge is not prescience of free choices, but of decreed choices. To suggest that foreknowledge determines choices is a gaffe in logic.)
For a more detailed discussion, here is a link to Romans 1:6: