What I think the religion of the Celtic cross came from is
probably the Pagan Druidic religion.
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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.
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Duidism
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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.
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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.