I will give you an example.
Today, we have countless telescopes of various types looking out into space to gather information on this universe. There has been a lot that has been discovered! Still more to come. For this example, let's consider the issue with the ideology of "a universe being created in 'maturity' roughly 6,000 years ago", and why there would be deception and untruth to it.
I don't want to get too involved with this, but will offer this. Anything that has a substantial distance of greater than 6,000-10,000 light years away from us, created at that time in the past, . . . shouldn't be viewable to us, as per the laws of physics, specifically the consistancy of the speed of light. The fact that we can view our solar system [roughly 100,000 light years across] should be enough concern. However, when super nova remnants can be discovered in distant reaches of the universe, then you must have a least that amount of time of universe existance, or else you have a lie/deception. An event that actually never took place, but the results of it created that would only deceive people later in history when technology improved to the point of viewing space.
Feel free to take this example as you would like. It, by no means, should be looked at as "christian bashing", or even "YEC bashing". It is what it is, and I would hope that people would grow and change about this as the church did when they stated a stationary earth as the center of the universe.
Blessings, Tailgunner!