Strong atheism has a total dogmatic conviction about its own correctness. It refuses to allow ideas to be challenged by any other means than those it considers valid i.e. the scientific method. It dismisses anything that conflicts with this method as hallucination or fraud. It proudly proclaims its own worldview based on scientism as the only true way to know reality and considers this worldview as superior to all other interpretations of life. It sets itself up as the sole authority in all areas. It fosters intolerance toward faith, potentially as damaging as the religious fanaticism it opposes. Strong atheists pretend to question everything and yet there is rarely a shred of evidence they ever had a single doubt about the rightness of their convictions. They have a high opinion of their own virtue, claiming moral superiority based on the belief that scientific control can create some kind of a heaven on earth utopia, while conveniently ignoring the fact that many scientific advancements have led to greater unhappiness, loss of control and alienation. I find it interesting how scientism has now become so much part of our modern mindset that it is no longer questioned. Even people of faith seem to feel the need to justify their belief with reference to science, suggesting that religious writings are literally true or scientifically verifiable. Coming up with outlandish, pseudo-scientific theories, like Intelligent Design in a vain attempt to provide proof. This has the effect of undermining belief in God by forcing people to choose between a poorly supported proof and an infinitely more sensible science based atheism.
Incidentally, I do not think a believer is under any obligation to prove the existence of God, anymore than they are under an obligation to prove the existence of ice cream. Nor do I think that your average atheist is particularly bothered about demonstrating the non-animate nature of the universe. The only persons who are really under such an obligation are those looking for converts; those who want to provoke a change of heart, to get others to see the world their way. Personally I have no interest in converting others as I feel each person is drawn along their own path. If I was to poke them with a stick, tell them to go this way or that, it would only lead to disaster.