Final answer:
Monotheistic faiths spread throughout the Arabian Peninsula through various means including trading networks, cultural exchanges, and social integration methods like intermarriage before the emergence of Islam.
Step-by-step explanation:
Monotheistic faiths spread through the Arabian Peninsula before the rise of Islam through trade routes and commercial connections, peaceful interactions and cultural exchanges, and migration and intermarriage. Prior to Islam, Christianity had already established a presence in the Arabian Peninsula, especially through trade interactions and social integration, which included intermarriage. With the expansion of commerce, Islam later spread along the trans-Saharan trade routes, creating a unifying network of believers bound by shared language, values, traditions, such as regular daily prayer, and encouraged intermarriage between Muslim traders and local women, who raised their children in the Islamic faith. This vast trade network facilitated not only the expansion of Islam but also the spread of languages like Arabic and Persian, further propelling the religion's reach through a shared linguistic, legal, and cultural framework.