To be religiously meaningful, the Church's baptism ritual would need to attest to a spiritual baptism that has already happened to the individual.
Not at all. The Rite of Baptism is the conferring of life in the Holy Trinity, not the recognition of it — that's what Christ said, and what the Apostles understood and what they preached.
At any rate, the Church's baptism ritual does not make a spiritual baptism happen.
In your opinion. If you don't agree with baptism, or the need for it, then take that up with Scripture ... even Cornelius (Acts 10), upon whom the Holy Spirit descended 'outside' of the Church, was baptised, and the Holy Spirit made sure Cornelius was in the right place before His miraculous appearance.
So I weigh your words against the word of Scripture, and the testimony of the saints and mystics and the Church, who insist otherwise. You'll understand if I should choose to go with them,
The spiritual baptism would involve a realization of Divine Unity by which the Living Truth can be incorporated into the person's living.
You don't properly understand Baptism. It's a beginning, not an end. It's an entry into life in the Holy Spirit, not the culmination of it.
And in Catholic doctrine, it requires the active co-operation and willing participation of the baptised, in an ongoing manner — it's not a guarantee, nor a forgone conclusion, nor an insurance policy.
The church ceremony (water baptism) actually has little value as a form of knowledge or as a foundation for faith. It's more an initiation rite with a social/culture meaning rather than a spiritual meaning. (It defines the individual's standing in relation to the community of faith and helps reinforce church membership.)
Well of course I'd expect that. I see it otherwise:
The Rite of Baptism is a symbolic act in the true nature of the term symbol, by which I mean the essence of the thing symbolised is actually and effectively present in the symbol (as opposed to a 'sign' which points to a thing but which does not encompass its immanent presence).
It is a Sacramental symbol by virtue of the fact that it was established, as a rite, by God, and given to man and not, as you suppose, as an empty gesture, but as a free and unmerited gift, which Scripture refers to as
charis and we as grace, by which man might engage in and with the most profound of Mysteries, a participation in the Divine Life Itself.
To say "baptism actually has little value as a form of knowledge or as a foundation for faith" only makes me shake my head ... I do like the way you set yourself as the benchmark of everything.
It certainly has a social and cultural dimension — how could it not — but that all you can see is the exoteric dimension does not mean the esoteric is not there, just that you can't see it.
The notion of having been "baptised into one body" actually makes more sense if one does not equate the body with church. "The body" can be seen as a spiritualized society rather than as a visible ecclesiastic organization. One might call it a divine society - i.e., a society that has been transformed in what the Vatican calls "the mystical body of Christ."
No, that's a cop-out piece of nonsense and an act of self-justification. That's just you working a loophole to get out of loving your neighbour. Read 1 John, he knocked that notion on the head in short order.
For if there is no body, no materiality, then the world is without reason, or purpose, or end.
That's dualism talking, something fundamentally opposed to the entire metaphysical corpus of the Abrahamic Tradition. It's very favourable, of course, because it lets you off the hook and you can get away with all sorts of stuff.
Btw, I have no problem with this Vatican position: "The Church is the 'sign and instrument' of the full realization of the unity yet to come." I would only add that there are other signs and instruments other than the Church, many of them naturally-occurring.
I don't think the Vatican would disagree with you, but the simple fact is that the Church is
the pre-eminent sign and instrument without equal, and the sole and only source of the Sacramental Graces — no other instrument possesses or even admits the Eucharist with such metaphysical rigour and preserves it with such rigour.
The 'unity yet to come' will be when those other signs and instruments array themselves about the Church accordingly.
Thomas