Reverend John MacArthur, a theologically uncompromising pastor in Southern California who influenced generations of evangelical preachers and became a culture warrior late in life, died on Monday in Santa Clarita, Calif. He was 86. His death, in a hospital, was announced by Phil Johnson, who headed Mr. MacArthur’s media ministry and edited many of his books. Mr. MacArthur had several operations on his heart and lungs over the years, and he had been hospitalized this month after contracting pneum