Wahhabism started to face internal and external challenges with the increased involvement of jihadist ideologies in regional wars, the rise of satellite channels as well as technology and the youth bulge in the late 1990s and early 2000s. Before that, Wahhabis benefited from the simplicity, purity and unity of their message: return to the early generations of Islam and tawhid (monotheism). Wahhabism thrived when it was able to channel all its energy — with near-limitless resources — against the trinity of what it labeled polytheistic or heretical practices: the mystical current of Sufism, heretical ideas of progressive or moderate clerics, and “deviant” teachings of Shiite Islam and other non-Sunni sects. The puritanical and categorical nature of its message had an appeal in villages and cities across the Muslim world. Its preachers had immeasurable wherewithal to conduct lavish proselytization trips to Africa, the Middle East, South Asia, and even Europe and the United States. Muslim expatriates working in Arab states of the Persian Gulf found it easy to obtain funds to build mosques in their home countries. Saudi embassies monitored Shiite proselytization and countered it with all the financial might they had, supplied by the Saudi state or charities.