True, Christians adopted many pagan symbols as their own, and especially Catholicism to a fault IMO. Additionally "idol worship" is clearly forbidden by the Bible, but I'd digress if I went any further on the subject.
As to you assertion of the linkage of the afore mentioned "major" religions, that also is true. However, neither "religion" has accepted THE crucial element and difference -- the Christ mentioned in the Biblical prophecies AND ergo fullfillment of those prophecies as "Saviour" or "redeemer" of the believer's soul.
I think the Muslims borrowed the ban on idol worship from you. But they're doing a bit better at it. :)