Final answer:
The statement that Buddhism, Christianity, and Manichaeism were the three religions of salvation that flourished in the Persian realm following the decline of Zoroastrianism is false.
Step-by-step explanation:
The statement is false. While Zoroastrianism did decline in Persia, the three religions of salvation that flourished in the Persian realm were Buddhism, Christianity, and Manichaeism.
Learn more about Religions in the Persian realm