Aren’t those elements of truth what they are all relative to?
We may have a misunderstanding on what relativism is. As I understand relativism, there is no absolute Truth and that each of us can have our own personal truth even though it conflicts with someone else’s idea of truth. For instance, one person may believe that Jesus was never bodily resurrected and another believe that he was. Under relativism they are they are both correct as per the concept of “my truth, your truth.”
The Church recognizes elements of ABSOLUTE Truth in other religions, such as Monotheism, the afterlife, etc.