Each major Christian denomination accepts some subset of doctrines that are commonly called into question by detractors from other denominations and, therefore, are commonly the subject of formal debates between apologists for and against such doctrines. For example, a Catholic apologist would probably pay special attention to certain Catholic doctrines that are commonly attacked by other denominations, whereas a Biblical Unitarian apologist would concentrate on other doctrines, and likewise Jehovah's Witness apologists, LDS apologists, SDA apologists, Protestant apologists, Pentecostal apologists, etc.
Question: What is an overview of doctrines per each major denomination or branch of Christianity that are most commonly called into question by detractors from other denominations and, therefore, concentrate most of the defense efforts by professionally trained apologists of said denominations?