Christianity is poison, because it preaches weakness and torment as the path of truth. It destroys a person's mind and does not allow him to live his own full life.
Why only Christianity? Every religion is a means of enslavement of the people. All the activities are intended to live at the expense of believers. Religion is more of a vampire than poison. It is not profitable to kill the victim. It is advantageous for it to parasitize.
It's difficult to place all religions in the same basket
I suppose it's mostly the Abrahamic religions causing grief among the world (Jews, Christians, Muslims)
I haven't seen many/any reports of violence/terrorism from followers of Shinto, Buddhism, Hinduism, Sikhism, Jainism, Satanism, Paganism, etc...
It's really just the 3 Abrahamic religions causing trouble... the other religions are rather benign (except perhaps for believing in a few fairy tales)