Alfred Rosenberg wrote a book Der Mythus des zwanzigsten Jahrhunderts (Myth of the Twentieth Century) in 1930, which the Nazis initially considered their scholarly foundation. It was full of pseudo-scientific and pseudo-historical nonsense, and was negative towards Christianity. Once Hitler became the chancellor, the Nazis grew concerned about how polarizing and downright bizarre Rosenberg's ramblings look to ordinary Germans, and they quietly stopped promoting his ideals.
Rosenberg was a controversial character within the Nazi party too. Other Nazi elites considered him a cringe pseudo-intellectual and Myth of the Twentieth Century had reputation as a book which every Nazi owned but nobody - allegedly not even Hitler himself - actually ever read. Rosenberg remained in Nazi Party's inner circle because at the end of the day he was a ride-or-die Nazi who had been in the party since before the Beer Hall Putch, and who Hitler had actually appointed as the new Nazi party leader while he was in prison. While Nazis were careful about giving him any too visible party roles in fear that he would embarrass them, he actively participated in war effort once WW2 started and became the Reich Minister for the Occupied Eastern Territories. He was executed after the war for the war crimes he committed in this role.