You’d be surprised to know how many people have been to heaven or hell and come back to tell the tale.
I happen to be interested in what are called “near death experiences (NDE).” People nearly die in hospital or in an accident and have a spiritual experience, but they are revived and return to tell the story of what they saw on the other side.
It so happens that NDE descriptions of heaven and hell are an almost exact match for how they’re described in Islamic teachings.
Look it up in YouTube. The vast majority of them, maybe 99%, are Christians who’ve made videos. However, people of all faiths have a similar basic experience, but it is tailored to suit their own faith.