When did humanity start ignoring the spiritual side of things and start becoming purely materialistic? I wanna say around 150 years ago or so, what does /x/ think?

It all seems so planned and unnatural. I don't think it was because of modern tech, it's definitely something else making people into "muh science!" atheists. Probably brainwashing, but when did it start? You don't just go from recognizing paranormal activity to becoming numb to it overnight.