Yes, their beliefs all on their own, every one of them. Their individual beliefs varied and disparate, all from their very own Holy Spirit, history, theology and "facts" about other's beliefs.
Hence: they think that the world begins and ends with them; alone and wrapped up in self.
A pitiful handful. Pray for them.
Every one backed up with scripture. Catholics use hearsay from those who claim “inside knowledge” like the Muslims and Mormons.