another quick hint on opening constructive dialogs with Christians

Don't blame Christianity for every dark point in the history of Western Civilization. Don't pretend that the obvious hypocrites were sincere Christians. Don't attempt to maintain that the sole efforts of the church were to exert thought control through force. Look, some awful people did some awful actions, no question. But how is that different from every other place and time on Earth?

Consider what would most likely have happened if Christianity, like other world religions, hadn't largely replaced the original belief systems. No religions worse than Christianity? Do some more research, this time with the objectivity.