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Christ alone. Our sin-debt must be paid to satisfy God's perfect justice and there is no other acceptable sacrifice than the cross. For God to just accept us on any basis other than Christ's sacrifice would be to violate justice. Can't happen. So... Acts 4:12 "Salvation is found in no-one else, for there is no other name under heaven given to men by which we must be saved."
Anyone coming to God can only approach through the sacrifice of the cross. That applies to everyone who has ever lived. Old Testament believers, though they never heard of Christ, are still saved through Christ. I am not certain that only those who hear and believe can be saved. IOW, some who have not heard and believed may still be saved, but still through Christ and his sacrifice. I think God's justice also demands that everyone have an equal chance at salvation. Not sure how that works, and Calvinistic"sovereignty of God" issues make it even more complicated, so in the end I just trust God to handle it.
I affirm "faith alone," but am a little troubled by the fact that, while Paul is very clear on faith alone, the Gospels are much more ambiguous. As often as Jesus says "believe in me," he says "follow me," which has different implications. Salvation in the Gospels often seems tied to what we do, as with the sheep and goats. Still, I think works are the result of faith - the fruit of salvation, not the cause.