You're misunderstanding me. Jesus honored the law and the ceremonial way of worship (including the sacrifices) instituted by God through Moses while he lived. (Let's drop the term Judaism, fair enough.) This was right and proper, until his death which fulfilled the ceremonial worship, the sacrifices were a type of Christ. When the Israelites rejected Christ the ceremonial way of worship (sacrifices and feasts) were terminated, and the Israelites having failed to accept this, and Christ as the messiah, they (the nation and their temple and their worship) were finally overthrown via the judgment of God in 70 ad. It was not a 'whole new religion' in the sense that the ceremonial worship, everything about it, the feasts, sacrifices, everything, were typifying Christ. The OT believers knew this and they knew the sacrifices were a type of the one coming great and final sacrifice of Christ to take away sin. OT believers were saved through their forward looking faith in Christ, typified by the sacrifices.