Some people will only "discover" what they already know. They do not want to learn. Learning hurts.
Atheists are bad people when compared to religious folks. They are mean, whiny, selfish, immoral, arrogant losers and worship themselves. Post cute one-liner memes as if that provides support for anything. Exchange verbal insults with prickly strangers on internet forums and act as if those strangers are a random sample of all atheists.
Ignore any evidence contrary to your assumption that atheists are worse than religious people. Like the fact that there are entire perfectly nice countries were hardly anyone believes in any gods or practices any religion. Canada, Japan and many western European countries like Denmark and Sweden are largely secular and yet, somehow, manage not to be horrible oppressive dictatorships or crime-infested hellholes.
Ignore the fact that US atheists are largely indistinguishable from religious folks on most every social indicator-- except where US atheists have lower
levels of many social ills, more education, etc. Many atheists (myself included) pretend to be religious from time to time to keep the peace in the family, at work, etc. And nobody can tell we do not really believe.
No godly neon warning sign flashes above our heads when we walk into a place of worship to fake belief for a holiday service. The atheism does not show up like an ugly skin rash.
It is like the way people who are racist always manage to find support for what they already think. Back in the day, researchers "discovered" that black people did more poorly than whites on intelligence tests. They decided it had to be a natural inborn defect, since there were clearly no economic, social or political reasons for blacks to achieve lower scores.
Black people were therefore inferior, closer to domestic animals than humans. It was proven fact. And thus it made perfect sense to deny black people college admission, good paying jobs and nice places to live. (One of the first such "studies" was done in 1910. Blacks had total social equality then, right?)
The racist researchers ignored any evidence that did not agree with what they already knew to be true. Blacks in northern cities consistently averaged higher scores on army aptitude tests than whites in southern cities. Black men drafted into the army in WWI and WWII managed to learn how to fly planes and operate complex military machinery the same as white draftees. And finally, if natural inferiority was really the case, black people would never have been able to pass for white-- their obvious inferiority would give them away immediately.
But none of that mattered. Same with attitudes about atheists. Some people know we are awful. They just know it. If only we had a god or two in our lives, we would not be so mean, whiny, selfish, immoral, and arrogant. Religious people never have those problems, or any problems, because they have assistance from god(s).
Let's not confuse such people with the facts. It hurts them to think.