You said:
>>Jesus, who in his lifetime addressed only the children of Israel-and came not with new laws but to fulfill the existing one left from Moses...<<
But Jeses said:
John 13:34
A new command I give you: Love one another...
Luke 22:20
In the same way, after the supper he took the cup, saying, "This cup is the new covenant in my blood, which is poured out for you."
John 3:16
"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life."