Sexuality is a spook, and at its core is just another ism that leads to tribalistic thinking. Just fuck who you want to fuck and leave each other alone about it. It's not super important.
Religion is a spook, and mostly a tool for enforcing social cohesion via shame and encouraging ingroup-outgroup thinking. However people should be free to believe what they want, as long as they don't use it as an excuse to harm others.
Discussion and debate, especially of politics, should occur with the goal of discovering the fundamental truth or best course of action of a particular matter, not simply proving yourself right and your "opponent" wrong. Sometimes you may truly be objectively right and your "opponent" objectively wrong, but using that as a foil to develop your own viewpoint and reach a mutual understanding is also part of the course of a proper debate.