Ps 23 supports the notion of a pasture with one Shepard.. as a metaphor.. i.e. sheep not penned up but grazing in peace with security..
John ch 10.. (Jesus words) speaks of "the" sheep pen.. using the synagogue as an example.. history supports multiple pens(christian) even multiple kinds of synagogues(at the time).. Unless you think Jesus was not prescient knowing of the future.. and spoke in lieu of the future.. The point being a denomination/church is in fact a synagogue.. Jesus never outlawed heresy.. Heresy is an invention of Men.. One sheep pen can (and do) see other sheep pens are heretical.. Witness "this thread"..
I stand by my 36: there is not scriptural support for conflicting doctrines or denominations in John 10, the Psalms, or anywhere else, and I explained why.