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What I think the religion of the Celtic cross came from is probably the Pagan Druidic religion.
Celtic tattoos have several particular defining characteristics. Some of the characteristics of Celtic tattoos are: complex designs, usage of black and swirling strokes, and very ornate designs.
Celtic religions were practiced until the various Celtic peoples were Christianised in the early centuries A.D.
Duidism
The religion in which polyandry is allowed and incouraged is called a Celtic indigenous religion and other Celtic societies. Polygandry is when a woman is allowed to have 2 or more husbands at one time.
Celtic religion started before Jesus had even come, they have been around forever, but the longer they go on the more they change and are forgotten.
The "Celts" of the English Isles were known for their Druid religion ( a pagan or Wicca like religion) but there ws also a large Christian grouping. The Celtic Cross was designed by these early Celtic Christians.
A Druid
Celtic Football club has never discriminated against religion or race.... we leave that to Rangers
Eoin Neeson has written: 'Celtic Myths and Legends' -- subject(s): Celtic Mythology, Celts, Folklore, Legends, Mythology, Celtic 'Aspects of parallelism in Japanese and Irish character and culture' -- subject(s): Civilization, Irish National characteristics, Japanese National characteristics, National characteristics, Irish, National characteristics, Japanese 'Celtic myths and legends' -- subject(s): Celts, Legends, Celtic Mythology, Folklore 'The first book of Irish myths and legends' -- subject(s): Deirdre (Legendary character), Legends 'A history of Irish forestry' -- subject(s): Forests and forestry, History 'The Second Book of Irish Myths and Legends' -- subject(s): Celtic Mythology, Legends, Mythology, Celtic
Ray Simpson has written: 'Exploring Celtic spirituality' -- subject(s): Celtic Church, Celts, Religion, Spirituality
Edain McCoy has written: 'Witta' -- subject(s): Celtic Magic, Magic, Celtic, Paganism, Witchcraft 'Celtic Myth & Magick' -- subject(s): Celtic Gods, Celtic Magic, Celtic Mythology, Gods, Celtic, Magic, Celtic, Mythology, Celtic 'Inside A Witches' Coven (Llewellyn's Modern Witchcraft Series)' 'Making Magic for Witches and Pagans' 'Spellworking For Covens' 'Bewitchments' 'A Guide to Astral Projection' 'Celtic women's spirituality' -- subject(s): Celtic Goddesses, Celtic Magic, Celtic Mythology, Goddess religion, Goddesses, Celtic, Magic, Celtic, Mythology, Celtic, Religious life, Women 'A witch's guide to faery folk' -- subject(s): Fairies 'Inside a witches' coven' -- subject(s): Covens, Witchcraft 'How To Do Automatic Writing (Llewellyn's \\' 'Ostara' 'Magick & rituals of the moon' -- subject(s): Miscellanea, Goddess religion, Rituals, Magic, Neopaganism