Did people still believe in witchcraft in WW1/WW2?
For WW2, it’s an overall no. As for WW1, it’s difficult to say. In 1914 (and a good while before that) belief in witches in civil society would have been laughed at, similarly to a secondary school student believing in Father Christmas. But the rural UK, especially Wales and Scotland, hadn’t been blessed with the modernising touch like villages today. Many still held onto old traditions, and beliefs in superstition and often demons were upheld. Whether that seriously extended to witchcraft is hard to determine, but possible. But if you’re talking about it being believed by all of society, then it’s a definite no.