Indeed.
According to figures from the last census in the UK, most people don't believe in god. Only 46% of the UK population does:
https://www.ons.gov.uk/peoplepopulationandcommunity/culturalidentity/religion/bulletins/religionenglandandwales/census2021
As for the ghosts bit, who knows? All we've got on that AFAIK is personal anecdote. Personally, I do because of an experience that I've had. When I share my experience, I'm met with a mix of "me too", open-mindedness and people thinking I'm mad.
Whichever way you look at it, beliefs are personal and nobody should force or coerce others to adopt practices of their own belief. Yes, people might empathise with me that my mum passed away 5 years ago, yes they might understand why I sometimes talk to her out loud... but I'm not so entrenched in my belief in ghosts to demand that they should talk to her too (and tell them that if they don't, they are being unkind invalidating my belief)**. However, that's exactly what happens when trans(-identifying) people guilt-trip everyone into using opposite-sex pronouns, accepting transwomen in women's sports and so on. They are forcing their belief onto others and calling them heretics (transphobes, bigots, Nazis etc) if they don't comply with this demand.
**I'm yet to hear anything back from her TBF. Mildly annoying, given I really didn't need to hear from the random woman that did engage with me. So I'm left in a position where I do believe in ghosts but haven't actually had any benefit from it. FFS.