Yes, it is. As are all perceptions and opinions, as opposed to facts.
So you're saying no one can have the fullness of the truth until all "streams" (I assume that means denominations or traditions) come together. Phrased negatively, you're saying "There is more than one group of Christians, therefore none of them can have the fullness of the truth." That does not logically compute. Fullness of truth doesn't disappear just because there are people who disagree, nor is knowledge of the full truth predicated on there only being one group of Christians.
As an analogy, consider math. Math is absolute. There is no bending. The fullness of the truth of math can be known by anyone if they receive enough education. But let's say someone proclaims 2 + 2 = 3. We have a mathematical schism. Them saying 2 + 2 = 3 does not change the fact that the fullness of mathematical truth (that is, everything our mathematical schismatic claims, but including 2 + 2 = 4) still exists, and that people know it or can know it.
The only way to make your conclusion true is by saying that humans cannot know the fullness of truth in Christianity. For a religion that claims the existence of absolute truth and a fulfilled divine revelation, that's kind of meh.
Then there's the issue of figuring what exactly all the "streams" are. Where does the validity line begin and end? How do you even quantify the number? Or is that unknowable too?
Um, no. You're taking what I experienced as an empirical, but personal and subjective observation in one situation and turning into a general principle, and that's not at all what I intended. I do
not mean that as a matter of principle, all the streams have to come together for maximum truth.
What do I mean? I guess I didn't explain at all, so I can see why you misunderstood. What I meant was that, IMHO, none of the three streams (I'm going to combine the two branches of Orthodoxy here because the differences between them aren't relevant to my point) have all doctrine correct, but all of them do have the bare essentials right, and are fully Christian, despite their differences.
Protestants (as a whole, though I know that's an oversimplification) are missing out on some things that Catholics have right. But Catholics don't (IMHO) have all of it right either. Orthodox have some things right that Catholics and Protestants don't. And Protestants (IMHO) have some things right that neither Catholics nor Protestants do. So, it seems to me that to arrive at fullness of truth in a Christian church, one would need to combine the best of Protestant, Catholic and Orthodox. It is
not a general principle, just one particular situation.
That is my subjective and highly personal opinion, and I don't claim anything more for it.
What are the minor differences? The answer varies from person to person. Real presence vs symbolic communion. Believer's baptism vs infant baptism. Belief in holy orders vs no holy orders. Belief that only men can receive holy orders vs women can also receive holy orders. Apostolic succession or no apostolic succession.
All of the above are completely contradictory beliefs that have been shoved under the amorphous, seemingly ever-growing "non-essentials" tent by various people and groups. Based on who you ask, some will say some or all of those beliefs are non-essential. Others will tell you some or all of them are essential.
To me, the only real essential is the Gospel of Christ. Like Paul, I am resolved to know but one thing: Christ, and Him crucified and resurrected.
Of course, I do have opinions on those denominational distinctives, and my opinions on those matters will affect my choice of church. But none of would stop me from worshiping as a guest at a church that didn't agree with them, or taking communion with them (if they'd let me - some do practice closed communion, which I disagree with but understand the reasons why). There are, of course, differences that go beyond denominational distinctives - if they have cult-like practices or non-Nicene doctrine, I probably wouldn't even visit.