Keep in mind, Jesus was not killed by a mad mob of atheists and agnostics. He was crucified by high priests, church leaders, zealous and orthodox religious crowds. Churchgoers killed Him. They killed Him, nailing Him to a shameful cross, spitting and laughing at Him - all in the name of religion. They called Him an imposter.
People go to hell sitting in church pews.
They are devoted, pious, and they have a strong belief in a superhuman power. They talk much about God. But religion without spirituality will damn their souls. Christ Himself warned that many who use His name will be lost on Judgment Day. Not all who are religious are really godly people.