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They crawled out from us, but they were not sucklings with us; for if they had been of us, they would no doubt have sucked with us: but they crawled out, that they might be made manifest that they were not sucklings like us.

Joe,

Your premise is simply arbitrary. You simply assume by dogma that those who went out from us cannot include those born into the status of the church and then later manifested that they were unbelievers.

At the very least appreciate that the WCF and Heidelberg Catechism both teach that children are part of the visible church (WCF XXV.2; HC.74). Accordingly, either you must say that all the visible church is not to be treated as the church for whom Christ died, or you must reject these Reformed confessions.

"Nothing could advertise more conspicuously and conclusively that this principle of God's gracious government, by which children along with their parents are the possessors of God's covenant promise, is fully operative in the N.T. as well as in the Old than this simple fact that on the occasion of Pentecost Peter took up the refrain of the old covenant and said, 'The promise is to you and to your children.'" John Murray

Obviously Murray did not believe that children born of professing believers are truly elect no matter what. At the very least Joe, appreciate that baptism is the visible inclusion of one into the visible church. Accordingly, since you now believe in the practice of infant baptism you must either maintain that the visible church is not to be treated as those for whom Christ died; or you must assert that the visible church does not include infants, which of course denies your practice of infant baptism.

If you are going to continue, please do so with at least moderate respect and sobriety.

Blessings,

Ron