1) Since Christ is not and I never suggested He was, a failure, you start with a slander. Strike one.
2) Next you post irrational gibberish. Strike two
3) Everyone given to Christ is saved, not potentially saved, for Christ will not cast them out.
4) Christ saves whoever God places in Him, 100%.
5) Christ laid down His life as a ransom for all, thus "purchasing with His blood" all mankind, including those who die in unbelief. 2 Peter 2:1.
6) But only those whose faith God credits as righteousness are placed in Christ and "receive" the forgiveness of sin.
If jesus died to atone for all sins for all sinners, and the father will was to reconcile all thru that act, it is a potential salvation being offerred to woo ever allows God to save them, and God would fail in the end if not all were saved!