Roxyite

Any followers of the true Goddess, Roxy Migurdia from the show Mushoku Tensei: Jobless Reincarnation.
The religion's founder is Rudeus Greyrat, who uses her panties(also known as Holy Relic) while praying.

You may also refer to this religion as Roxyism or the Roxy Supremacy, however in Mushoku Tensei: Jobless Reincarnation season 2, Episode 7 the name Roxyite officially became canon.

What's your religion?
I'm a Roxyite.