Here's something to consider.
The 20th century saw tens of millions of people dead at the hands of government. Largely leftist, socialist government. And we're not talking mere 'mistakes were made' deaths in large part, not accidental deaths, but out and out planned 'let's kill all these innocent people' deaths.
But religion gets tagged as the big existential threat by person after person.
Communism saw the rise of Lysenkoism, and suppressed research across the board in the name of ideological purity, complete with scientists being sent to gulags.
People don't know about this. But they damn well know about Galileo being harassed several centuries ago, and say religion is anti-science.
Religious people were murdered by socialists throughout the 20th century - churches destroyed, clergy threatened, faithful sent to re-education camps or just plain killed.
But atheists are the ones who have been historically bullied.
What amazes me about the above is not the facts themselves, but how so much of this data has been systematically wiped out of our common cultural memory. An amazing trick, and I wonder how it happened.