William, the issue is not that God knows all the sins that will ever happen, but that He has accepted His Son's sacrifice as sufficient to satisfy (propitiate) His justice for all of them. It's like shooting spit wads at a 40 ft solid thick steel wall thinking that you can penetrate it.
There is perfect provision for all past, present, future sins. It is a once-for-all sacrifice. No further provision is needed besides this objective reality.
However, there is a subjective appropriation of this provision since all are not saved (universalism) just because He died. There are wise conditions and ways to deal with sin in the unbeliever and believer.
Excuse me for living, but I cannot defend cleansing from sin while it is defiantly persisted in. This would undermine God's character and law and harm us and others.