One ought to know they are saved, why and how, before being baptized. Infant baptism may bind by covenant (as a vow) the adult congregation to the infant, but does not necessarily bind the infant to the adult congregation. Baptism can only be meaningful to the one baptized where the Grace of God in the Messiah has been first understood and received by the one being baptized. That GRACE saves and delivers one into the true and invisible church. What it creates between those baptized in the flesh 1 and the church on the earth today is known to God but not always to men. Not all who say there are the Messiah’s have faith2. God’s grace and faith have by the power of the Messiah’s blood to save even the undunked. 3 The real error is how much we believe the water saves while it is the Blood of the Messiah and the (immaterial) Spirit of God which does save! This is the substance of the New Covenant. There must be sentient reconciliation between the person and the Persons of God! Then he or she will know they are saved even if no one other than God does!
1 And you did he make alive, when ye were dead through your trespasses and sins,
2 wherein ye once walked according to the course of this world, according to the prince of the powers of the air, of the spirit that now worketh in the sons of disobedience;
3 among whom we also all once lived in the lust of our flesh, doing the desires of the flesh and of the mind, and were by nature children of wrath, even as the rest:--
4 but God, being rich in mercy, for his great love wherewith he loved us,
5 even when we were dead through our trespasses, made us alive together with Christ (by grace have ye been saved),
6 and raised us up with him, and made us to sit with him in the heavenly places, in Christ Jesus: 7 that in the ages to come he might show the exceeding riches of his grace in kindness toward us in Christ Jesus: 8 for by grace have ye been saved through faith; and that not of yourselves, it is the gift of God; 9 not of works, that no man should glory.