How does the Catholic Church reconcile Catechism #841 which says, "The plan of salvation also includes Muslims" (who deny the resurrection) with 1 Corinthians 15:14 that says "If Christ be not risen...your faith is in vain."?
God surely wants to save all and has set plans in place to do so through the preaching of the Gospel. That the plan of salvation aims for all does not mean that all are in fact saved. If one were to knowingly reject Christ after having Him effectively preached, they may well forfeit their salvation. However, not all have had Christ effectively preached, and the Church leaves the final determination to the Lord of how culpable they are of their seeming rejection of Christ.
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