'Christian' used to be a throwaway word. People didn't used to use it much. People didn't start self-labeling or getting labeled Christian until the last part of the 20th century. Before that, you might identify as a Baptist, or a Southern Baptist or a Methodist. But there wasn't one identifier that put you in a fold with all the other believers.
There is this tremendous amount of arrogance and hubris, where somebody can look at something for five minutes and dismiss it. Whether you talk about gaming or 20th century classical music, you can't do it in five minutes. You can't listen to 'The Rite of Spring' once and understand what Stravinsky was all about.
If I had to imagine omniscient, omnipresent, omnipotent power in the universe that chose to make my mother suffer, I don't know how I would make that make sense in the universe.
Believing there is no God means the suffering I've seen in my family and indeed all the suffering in the world isn't caused by any omniscient, omnipresent, omnipotent force that isn't bothered to help or is just testing us, but rather something we all may be able to help others with in the future. No God means the possibility of less suffering in the future.