As I was going from Christian believer to spirtually leaning agnostic and my beliefs changed fairly significantly I began to form/understand what I see as a principle of what Jesus and other religious figures have taught.
IMHO, it boils down to love and truth, and the journey to conitinually discover the depth, bredth, and meaning of those.
Relating to your post of what we thought were facts and chnages in our perception.
If we place truth as one of out priorities, truth in being honest with others , truth in our self examination, truth in embracing facts and discarding false perceptions and traditions, we strive to move forward based on what we percieve to be true at the present moment.
So, when I was a Christian, I was being true to myself at that time. True to what I percieved as truth and fact at that time. When I started asking questions of doctrine and myself I gradually let go of certain beliefs. That was also being true to myslef and placing truth itself as a priority.
As people we are intellect and emotion and part of being true is learning to balance and evaluate those aspects of our humanity. We need to discern when we are hanging onto something that isn’t true and why, and why we resist embracing and dealing with the truth that life inevitably sends our way.
When believers hold onto dogma and the teachings and traditions of men over facts they impede thier journey rather than improve it.