Just curious, but -- if you are seeking "spiritual advancement, possibly to enlightenment" -- are you in the habit of clinging to your religious and/or spiritual beliefs? Do you hold your beliefs firmly? Do you see them as necessary for your spiritual advancement?
I think all spiritual paths end in the same goal. But I cling to my current beliefs because they are what makes the most sense at this time in my life; but that does not mean these are not subject to change later, but I have a feeling they will not.