Does Truth Change?

Let's try this from another angle, literally. I created this schematic:

The original church (taught by the apostles who walked with Jesus) knew Jesus' ministry far better than anyone else. They learned directly from Him. And Jesus taught according to the Father's will. Therefore, the apostles knew without a doubt what the Father's will was.

So, the original church and the Truth existed in the same plane of time. They were one and the same. The Truth never changes, so it is represented by a flat line that remains unchanged in direction.

Let's say that the church (over time) deviated just one single degree from the Truth that was relayed to the apostles. That one degree separated them from the Truth, even if only a measly degree. Over time, the separation becomes more noticeable. Maybe this results in many denominations... did you know there were an estimated 43,000 Christian denominations as of 2012?? In the year 1900, there were "only" 1,600. Still a far cry from the ONE denomination that existed at Christ's ministry.

So, then you and I were born somewhere after this seemingly minute deviation occurred, and we're used to the deviation because it existed before we were even born. To us, it's truth. But it's not really, because it has deviated from the Truth that Christ taught 2 millennia ago. And then you have the church today, 1984 years after Christ taught. And that single measly degree has suddenly become a vast separation from the Truth that never changed.

For the church today to remain dogmatic that it KNOWS the Truth... you have to ask yourself - how did one denomination turn into 43,000?