How did Siddhartha Gautama view other religions of the region?

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During the time of the Buddha, Hinduism did not exist. The religion

that it was born from, Vedicism, was the religion of the time.

Jainism had been around for 200-300 years and during the Buddha's

time, Mahavira was reinvigorating it.

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Buddha disliked the Caste System of the Vedic religion. He also

disliked the self-mortifications done by the Jains and other

ascetics, instead proscribing the Middle Way, between indulgence

and self-mortification.

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However, Buddha allowed converts to continue worshiping their gods.

He also allowed Jain converts to keep their Jain identities and

continue to give alms to Jain ascetics.