Ergun Caner's introduction to Louis Ruggiero's recently released book is short (two pages). The first page, first sentence is this: "For the first half of my life, I was raised a Muslim. My father, an ulema (that is, a scholar in Islam) drove home the key concepts of Islam that guided every single step of our lives." There are several issues with this sentence. By the time he wrote this foreword (it was apparently written in 2009), Caner was over 40. His time as a Muslim was significantly less than half his life, if he was saved in 1982 (as he has written). 1982-2009 is about 27 years, as opposed 1966-1982, which is about 16 years. Next, no corroborating evidence has been brought to show that Caner's father has any particular scholarly credentials or experience. That Caner's father is a Muslim appears to be true, and there may even be evidence that Caner's father was active getting the local Islamic foundation going. Indeed, for all we know, Caner's father may have been a scholar - we just haven't been shown any evidence of that. However, to say that he is "an ulema" is not correct. The word ulema is the plural form: "scholars" not "scholar."
P.S. I should point out that I have not yet read Louis' book from cover to cover.