Hi there! I'm Sage, one of the founding members of Clann Bhride. I am more than happy to answer your questions. :) You can reach me or any of the other founders at firstname.lastname@example.org. We also have a Facebook group that is fairly active - 290 members as of today.
We are an interfaith devotional group. We have members across the Pagan and polytheist spectrum, from Celtic Reconstructionists to Druids to folks who practice various forms of witchcraft to Wiccans. Many folks have come to Clann Bhride after already meeting Brighid and find that they like the community and the resources we offer. There's no reason you would need to give up any other religious commitments, or personal relationships with Brighid, just because you wanted to participate in our community.
If you haven't already, I'd recommend you look at our website (recently redesigned!) at clannbhride.wordpress.com.
Again, please let us know if you have any questions!