I don't believe in all that stuff about ghosts.

我不信什么鬼呀魂呀的。

《牛津词典》

I don't believe in ghosts.

我不相信有鬼。

《柯林斯英汉双解大词典》

I don't believe in ghosts, but there must be something fishy going on.

我可不信有鬼，但肯定有什么可疑的东西。

youdao

"I wasn't scared when I saw her, I just got the creeps, " said the teenager who didn't believe in ghosts before his experience.

BBC: Traffic jam after 'ghost sighting'