Who is a Believer?

What is considered heresy (kefirah) in Judaism? Must every Jew believe in all tenants of our faith, with zero doubt? Or is there room to have doubts but still be considered a believer?

Based on the popular book Headlines: Halachic Debates of Current Events by Dovid Lichtenstein, this sourcesheet was adapted for teens by Aryeh Kaminetsky. Formatted and edited by Rachel First. Includes the tzuras hadaf for the quoted Gemaras.

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