's going against the Pittsburgh Steelers on the field ... but he's standing united with the city Thursday night ... honoring the synagogue shooting victims with "Stronger than Hate" cleats.
The Panthers superstar revealed the kicks just minutes ago during pregame warm-ups ... showing a mock-up of the Steelers logo with a Star of David and the phrase "Hatred Can't Weaken a City of Steel."
Ben Roethlisberger wore similar custom cleats over the weekend against the Ravens ... and Julian Edelman showed support with Team Israel hat from the World Baseball Classic after the Patriots game on Sunday.