If Islam had not entered India, I think Buddhism would not have collapsed as in OTL, but would have survived as a major religion. Sikhism would not have made its appearance. Jainism
might have survived as in OTL or spread a little more wider. Buddhism, being a more organised religion could not withstand the attack of Islam on their monasteries and strongholds. What helped Hinduism to resist the pressure of Islam was the caste structure which is viewed as the curse of Hinduism in the modern era. The hold of the caste is much stronger than that of the religion and the one who steps out of its border line is made an outcast. So either castes converted to Islam totally or total resistance was the rule. Hence only backward castes were willing to convert generally.
Harsha is considered as the last Hindu emperor who ruled over North India. The empire that rose in Bengal in 750 AD was the Pala Empire which favored Buddhism. in South the Cholas who rose in 850 AD were the most powerful empire. The Cholas were staunch Saivites. If Palas and Cholas had flourished in their areas and ruled longer, Buddhism would have grown in North India and Hinduism in the South. In the absence of Islam, the rise of the Vijayanagara and the Marathas are doubtful. But the rulers will undoubtedly be Hindus. In the Indo-Gangetic plains, powerful rulers would have risen as the Mauryas, Guptas and Harsha had done earlier. In the absence of Islam the Buddhism would have been more influential in India. Sikhism would not have been born. The caste system would have become weaker and untouchability might have not developed. Hinduism would have been more liberal being influenced by Buddhism and also not requiring to resist the onslaught of Islam.
might have survived as in OTL or spread a little more wider. Buddhism, being a more organised religion could not withstand the attack of Islam on their monasteries and strongholds. What helped Hinduism to resist the pressure of Islam was the caste structure which is viewed as the curse of Hinduism in the modern era. The hold of the caste is much stronger than that of the religion and the one who steps out of its border line is made an outcast. So either castes converted to Islam totally or total resistance was the rule. Hence only backward castes were willing to convert generally.
Harsha is considered as the last Hindu emperor who ruled over North India. The empire that rose in Bengal in 750 AD was the Pala Empire which favored Buddhism. in South the Cholas who rose in 850 AD were the most powerful empire. The Cholas were staunch Saivites. If Palas and Cholas had flourished in their areas and ruled longer, Buddhism would have grown in North India and Hinduism in the South. In the absence of Islam, the rise of the Vijayanagara and the Marathas are doubtful. But the rulers will undoubtedly be Hindus. In the Indo-Gangetic plains, powerful rulers would have risen as the Mauryas, Guptas and Harsha had done earlier. In the absence of Islam the Buddhism would have been more influential in India. Sikhism would not have been born. The caste system would have become weaker and untouchability might have not developed. Hinduism would have been more liberal being influenced by Buddhism and also not requiring to resist the onslaught of Islam.