Park United Methodist Church minister Mike Allen knew it would turn his life upside down -- cost him his job, his home and his preaching credentials.Despite the certain consequences, the Lexington pastor made his choice.One Sunday in January, he stood in front of his stunned congregation and broke the news: He was going to follow his heart and convert to Roman Catholicism.With that decision, Allen joined not only thousands of members who are leaving mainstream denominations, but hundreds of Protestant ministers who are joining the Roman Catholic Church.For Allen, conversion was an eight-year process of study, prayer and reflection.It began...