Why does Islam, despite being newer than Hinduism, Buddhism, and Jainism, feel so old?

According to Osho, a religion’s 'age' reflects the consciousness of its first listeners, not the calendar. Islam, though historically newer, arose among a harsh, warrior culture, so Mohammed spoke in their direct, combative idiom, even proclaiming peace by the sword. By contrast, India’s millennia of spiritual refinement let Buddha and the Upanishads speak subtly. Hence Islam can feel older because its language mirrors a more primitive cultural stage.