Not exactly true. Christianity is the only one to claim exclusivity of salvation through one person that being Jesus Christ outside of works. All others are works based: Islam (claims same God as Christianity, Judaism, ect.), Buddhism, Taoism, Confuscism, Judaism, Mormonism, Jehovah's Witness most atheist ............. The works of good/holy/right are all consistent in their measurement across the board. As a Christian if I am wrong, I would be allowed eternity in every other religion based on their own principles of works (Yes, even Islam. Read the Koran). However, if every other religion is wrong only the one who believes in Christ goes to heaven. The Atheist is 50/50. If he's right he's dead, if he's wrong he's in hell
Even a ignorant person could see those odds. Something to think about.
Back on topic. Their can be vitriol on both sides. Doesn't make it right or justified. You have to call them as they come.