Of course you can have a dialogue on absolute. It is the only thing truly worth having a dialogue about! Me and a muslim friend have inter-religious dialogues regularly. We both have different beliefs about what is absolute. And guess what? We don't kill each other over it. We talk about what we agree on, what we disagree on, we learn from each other and ultimately come to understand our own tradition better through encountering theirs. I become a better Catholic; He becomes a better Muslim. This is only possible, however, if we both profess what we believe and do so without fear.