Based on past experience, anyone physically attacking people of a particular religious group, including burning or otherwise trying to destroy a religious building (church, mosque, temple, etc.) will be a nut motivated by racial and/or religious bias.
It will probably
not be an atheist personally annoyed by the existence of religion and religious people.
Religious people and buildings, historically, and worldwide are most often targeted by
people of a different religion. Sunni Muslims and Shia Muslims burning each other's mosques in Iraq. Christians attacking Jews in Europe. Hindus attacking Sikhs in India. Protestants bombing Catholics and vice versa in Ireland. Various extremists purging the apostates from their midst.
Religious people are pretty safe from us godless heathens. You godly folks need to watch out for attacks from each other!
BTW When will the conservatives start to complain about the atheist "War on Halloween"?