I assume that is the Presbyterian church USA ? We do not use any prayer books in the PCA.
You said, "I have attended MANY services at Baptist churches, AOG's , Methodist ,.Wesleyan, Nazarene, Church of Christ and many other non denominational churches, I am a Presbyterian and I have never heard the "Our Father" used as a part of the service NEVER."
You were dead wrong about the Prebys, and I'm pretty sure you're dead wrong about the others too. My grandfather-in-law was a Methodist minister, and I'm now holding his personal hymnal with the Order of Worship in the back. Order of Worship I, item 7 is "The Lord's Prayer - which may be said or sung". Order of Worship II, item 12. Order of Worship III, item 6. Order of Worship IV (morning or evening prayer), item 7 "to be said by all."
I'm not going to go hunt out all the other denominations for your benefit, as Cromwell said, "I beseech you, in the bowels of Christ, think it possible you may be mistaken."