Other gods and traditions were absorbed into Hinduism helped it to spread.
Explanation:
Hinduism is known for sharing some similarities with different faiths spread across the world, such as the number of gods being worshipped. Hinduism boasted a pantheon of gods, which other faiths like Greek and Egyptian also shared.
These faiths have specific traditions and rituals to be followed for a particular god, being one of the reasons why it was fused into Hinduism and also lead to the spreading of the religion as people were able to relate their faith to this one too.