I have no proof that John Akin's father was born in Ireland, only family legend. However, the generation that said it would have been his grandchildren so possibly it is true. I suppose I was hoping that you might see the name and something click. As for his ever having been in Pennsylvania, again, I do not know, but their religion was Protestant as were most of the Scots and Irish that were in PA.
Here is what I do know. His full name was John Mack Akin and he was born about 1820 died 1877. He is probably buried in Haywood County, TN. where he settled by 1860 when he first appears on that counties census. He married Eliza Witt about 1848. She was born in Tennessee, so he was probably in the state before that date.
He was a blacksmith during the civil war and had ten children. Their names were: 1. Hezekiah Butler Akin; 2. Pleasant N. Akin; 3. Charlie V. Akin; 4. John W. Akin; 5. A. Josie Akin; 6. Henrietta Akin; 7. Elizabeth Akin; 8. Marilda Akin; 9. Rosa E. Akin; 10. Flora A. Akin. Are any of the names familiar to you? The family was very musical and enjoyed country dances. In early legal documents the name is spelled variously, "Aikin, Aitkin, Akin."