Objective truth is relative truth, at least relative to the time in which it is postulated.  That's why HV was not received by the Catholic lay population.  It's truths were no longer truths given what humanity had learned about procreation.  The dogmatic statements promulgated at Nicaea have not been factually disproven and so I would agree with you that for now they are Catholic/Christian truth.  I would not be so quick to say that 100 years from now that would still be true.  It could be that we discover we are not alone in the Universe and that might have a huge impact on what we consider to be truth.