Apparently, the only offended Christians that the Sun could find to express their offense at the Jesus-plus-Phallus were Christian Voice, who in most circles - including pretty much every other Christian organisation in the UK - are regarded as batshit crazy. Christian Voice refuse to say how many members they have. They appear to mainly be Stephen Green, who's the only member ever mentioned or quoted.
The Christian Voice website is good for a laugh, if only because it's indistinguishable from a parody. At the moment they have a counter displaying "Time which billionaire Jewish art collector (and friend of the Chief Rabbi) Anita Zabludowicz has had to destroy her blasphemous, pornographic statue of Jesus Christ with a phallus attached, since getting it back from the Baltic Centre in Gateshead at 6.00pm on Saturday 20th January 2008."