Resurrection of the Head and inextricable relation to its Mystical Members

"For it is necessary that the satisfaction of one be as it were the satisfaction of all, and that the Spirit, who fits for a holy and happy life, should flow from him, as the head, to us, as his members; and so, that he become 'the Saviour of the body,' Eph. 5:23. The Scriptures frequently call this mystical union a marriage. But it is the inviolable law of marriage, that the persons married be of the same nature: 'And they two shall be one flesh,' Gen. 2:24. Paul hath taught us that the mystery of the spiritual marriage of the church with Christ lies concealed in these words, Eph. 5:31, 32" (Herman Witsius, The Economy of the Covenants Between God and Man; underlining mine). 

The demonic doctrine or teaching that Jesus Christ died for everyone without exception [1] DENIES that everyone for whom Christ made satisfaction will be the recipients of freely-flowing, Spirit-wrought, regenerating grace; it is a denial that Christ is the Savior of the body (Ephesians 5:23). To deny the regeneration (or resurrection) of ANY PART of the BODY is to necessarily deny the resurrection of the HEAD, who is Christ.

[1] Commonly called or referred to as "universal atonement."

"But if Christ is proclaimed, that He was raised from [the] dead, how do some among you say that there is not a resurrection of the dead? But if there is not a resurrection of the dead, neither has Christ been raised. But if Christ has not been raised, then our proclamation [is] worthless, and your faith is also worthless...For if [the] dead are not raised, Christ has not been raised(1 Corinthians 15:12-14, 16; underlining mine).

If "there is not a resurrection of the dead" of the mystical members of Christ's body -- which members are unconditionally chosen in Christ by God from eternity (Ephesians 1:3-4) -- then it necessarily follows that "Christ has not been raised." Jesus said that because He lives His people shall live also (John 14:19). He also said:

"Even as the living Father sent Me, and I live through the Father; also the [one] partaking Me, even that one will live through Me" (John 6:57).

If you believe that Jesus Christ died for everyone without exception then you are dead in your sins; you do not live through Him; "and your faith is also worthless" (1 Corinthians 15:14). If you think such deniers of Christ's resurrection are simply "muddled true believers" then you know not the power of His resurrection (Philippians 3:10), and you have yet to receive the Spirit of God so that [you] might know the things that are freely given to God's people (1 Corinthians 2:12). Repent and believe the true gospel wherein the only righteousness God accepts is revealed (Romans 10:1-4).