> secularists brought us the most violent conflicts in history

They didn't do this 'because of secularism' and that's a big difference. They tried to replace religion with other dogma's en use the religious control for their own purpose. Sure, being a secularist doesn't make you good or non-evil. But without dogmas it will be pretty hard to convince others to blow themselves up for your evil plans.

No one ever committed mass shooting while shouting 'in the name of science', or 'I hate you because I am a securalist.'