Please provide the chapter and verse where the Bible says specifically that Christ ate lamb (and I don't mean the Passover meal).
And, again, even if He did, it DOES NOT MATTER. The Passover meal was strictly about the atonement for sins. If Christ ate lamb at the Passover meal, the message to take away from that IS NOT that eating meat is somehow virtuous and being a vegan is not. The message is that Christ IS the Lamb of God and that Christ reigns, period.
It appears you're still living in pre-resurrection days. Post-resurrection, the lion lies down with the lamb and we return to the Garden, where man is, clearly, vegan.