With respect, that wasn't a message, it was an ACTION, a deed, it was THE action, it was THE deed: He died for us. We may live forever with God because Jesus died for us, and while one can rightly argue that there was a very powerful message in that deed, I recall a message Jesus had for God as He was dying for us: "Forgive them Father, they know not what they do."
When Jesus was here and among us, His primary message as He spoke it and taught it to us, was for us to love God with all our heart, mind, and soul, and to love your neighbor as you love yourself. Caww, what "false love"? Love is love, and IF it is love, then it is God, as the bible says "God is love." Love is CRITICAL, it is CRUCIAL, it is the KEY. People know in their hearts when they're falsely calling something "love" when it is only desire, lust, avarice or yearning. "Religious" folks trying to scare people away from love by worrying them that it might be "false" is a sure recipe for increased strife and vanity.
LOVE -- love God, love others, love yourself -- THAT was His specific, spoken message. Dying for us was more than a message, much more. I don't confuse His message -- wisdom, teaching, incredibly wise rules for living in harmony with each other, with His sacrifice. His message shows me the ways to do things right; His ACT, His sacrifice of dying for me, gives me the chance for eternal life.
Interesting that you gloss over the rest of what I said, which was that Jesus was God Himself. THAT was the main message. It isn’t necessarily an ACT, like dying for our sins, but it contains action inherent with the claim.
When Jesus was here and among us, His primary message as He spoke it and taught it to us, was for us to love God with all our heart, mind, and soul, and to love your neighbor as you love yourself.
***And when he came across someone who claimed to have followed all of that, did he say “ok, you’re complete, you’re saved”??? NO, he said, “Come, follow Me”. That puts what you call the primary message in its proper place, subsumed to following Christ. Period. So, what was the “primary message”? Follow the 10 commandments? NO. The primary message was “Come, follow” HIM.