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God "...will have all men to be saved, and to come unto the knowledge of the truth" (I Timothy 2:4).
That's pretty tough to believe, isn't it.
And the original Greek doesn't say God merely "hopes" to save all, it says He is "willing" to save all, meaning God is ready, eager, and prepared to do this! Not at all reluctant! This fact is born out in Isaiah 53:10, for a great many translations tell us that God "was pleased" to sacrifice His son for us all -- for He LOVES us all!
"All" would include all young children who have ever lived, all the mentally deficient, all the insane who have ever lived, all of the billions of people who, not knowing God, have worshiped false gods, and "all" would even include those who have led extremely wicked lives.
So are all of these multiple billions of His creation actually going to learn the truth and be saved as God claims?
In most people's minds that's indeed very hard to believe -- even for most professing Christians. But as the evangelist Paul Finkenbinder (aka, Hermano Pablo) stated many years ago:
"Pessimism is sin."
For proof of this he gave the example of how the Israelites who had been sent to spy out the Promised Land, came back with a very gloomy, pessimistic report. You can read of this in Numbers 13:25-33. Basically, their message was that the land promised by God was impossible to take because of its "strong" defenders and "very great" walled cities. What God had promised them, they considered unachievable and absolutely impossible to obtain! To them there was NO WAY that Israel could enter and take the land that God had promised them!
But this lack of faith in God's promise had very serious repercussions, even more serious than their constant complaining after leaving Egypt, and even more serious than their idolatrous worshiping of their molten calf! The Bible clearly states that it was this lack of faith, this unbelief -- and the unbelief of those who heard their message -- that resulted in God (in the Person of Christ) not granting to them entrance into this Promised Land (Hebrews 3:18-19; 4:6,11). Today, in much the same negative vein, we hear religious leaders and Bible teachers claim that God is incapable of bringing us all into the Promised Land. And like the reasoning of old, it's usually based upon a faulty premise that we cannot count on God to do it all, so it's up to us.
Some even claim that God has no desire to save everyone, or that He is hampered by man's supposed "free will" and needs "our permission" to save us! The result is the same. The pessimism and unbelief that existed amongst God's people in ancient Israel, is prevalent today throughout the modern churches, churches composed of people who likewise claim the 'Promised Land' -- be it heaven or a New Earth -- will not be attainable for most people!
The truth is that if we want God to save us in this life, then we need to trust in Him, have faith in Him, rely upon Him, and most of all -- love and BELIEVE Him. Our salvation (in this life) is dependent upon it.