Religious tolerance assumes that a person does not discriminate against another person's religious beliefs, even if they think that the person's beliefs as wrong. Religious tolerance differs from religious acceptance.
For example, a person of the Jewish faith may think that Jesus is not the Messiah. A person of the Christian faith may not belief that the Torah is the complete version of the Bible. Each person can disagree silently with the other person's religious belief system without discriminating against them or making them feel less about themselves or wrong. This is the foundation of religious tolerance. Religious tolerance does not involve believing that all religions are true.