If you are exposed to Jesus Christ and you willingly turn away from him, reserve your place in hell.
Catholic 101.
I guess Lumen Gentium cancels "Catholic 101"? Even your own magesterium concedes that Christians - legitimate Christians - exist outside of the Roman Catholic Church. I actually turned towards Jesus by leaving the Catholic religion. I am one of His sheep, who heard His voice and follows Him. Hell has NO place for me. Sorry if that disappoints you.