There is a linguistic theory which states that languages at the periphery of a family's range share the most common traits with the ultimate common language. So, Old Irish and Sanskrit, for example have many similar archaic traits derived from Proto-Indoeuropean.

As language is a keystone to any culture, it stands to reason that there would be religious similarities as well.

Perhaps Farrar and Bone can answer that: in their book "Progressive Witchcraft", they discuss the draw of modern Pagans towards religions like Hinduism, Shinto, Voodun, and Santeria. The reason they give is because these are LIVING traditions, able to adapt to the modern world. They speculate that if Europe had not been Christianized, those pagan traditions would have evolved into something like Hinduism. In fact, they advise that all Witches visit a Hindu temple at least once in their lives, to feel the presence of living gods. Now, considering that India was under British rule for nearly a century, and that many Indians call the UK their home, this connection does not seem all that far-fetched. Now here in America, it may be harder to make the connection, which is odd considering that many Pagans I know combine Celtic with Native American spirituality. Why? Because for many of them it's part of their ancestral make-up (I'm part Irish and part Cherokee Indian). Now, many of our great-great-grandparents were from the UK and Ireland, and upon comming here, settled in large metropolitain areas and in the Appalachian Mountains, and many of us who are practicing Pagans and have Scots-Irish roots feel that we should honor the gods of our ancestral homeland and ancestral people...they Celts. And of course this just goes back to what Farrar and Bone were saying: we have Celtic roots, and we try to revive the old gods, and so get inspiration from living traditions, Hinduism being the most accessible.
Whew! It's a roundabout answer, but there you go.

Christianity is an interpretation of the solar religion of Egypt, this story is entirely astrological as told by the bible. Christians didnt actually take over our culture, my ancestors absorbed it and made it their own, until the Roman Catholics decided to end the Celtic Church due to its closeness with Paganism.

The goddess Brighid is derived from the term 'Brahti' : in Sanskrit means 'High One'. The ways of the Brahmins and the Druids are extraordinarily similar in philosophy. I would be more inclined to question a Jewish link to the Celts, as there are no similarities in culture or DNA. Whereas, genetically, Europeans are from Central Asia and India.