Does Hinduism say that one cannot attain “Moksha” (salvation) without becoming a Hindu?
No, it does not. Hindus believe that there are many paths to God, although some may be longer and more complex then others. Therefore, all religions are different pathways that lead to the same destination. According to Hinduism, all living beings will eventually merge back to their original source, the Supreme Soul, no matter what path they may choose to take. That is why Hindus are expected to respect all religions.
This Q/A was taken from the book Hinduism: Myth and Reality written by Ajit Adhopia and published by Inderlekh Publication.