About the absoluteness of truth: many people are mixing 'a truth' and 'an opinion': most people state their opinions as if their were facts, and thus truths.
E.g. 'this is beautiful' sounds like a facts and a truth, but really means 'This is beautiful to me'.
Truth is absolute in the sense that it does not change depending on who is talking. Opinions do change depending on who is talking.
If someone does not agree with an opinion, both parties are (or may be) right. Opinions should never be forced on someone.
If someone disagrees with a truth, they are plain wrong.
- God exists.
- FDS is all anointed.
- God disapproves of organ transplants
These are absolute in that they are either true or a false. The facts do not change based on who is talking (but the opinion about it does change).
So if someone changes their opinion on the truthfulness of these statements, they are either wrong now, or before, or both. The real truth of these statements never changed though.