Could God save the whole world if He wanted to? Of course. Is He going to save the whole world? No. He has chosen a fold out of the world--not based on their qualifications, but based on His own good pleasure. He is God, ruler, sovereign and does what He will. There are those who struggle with this fact, who fight it and try to find every way out of accepting it . . . and there are those who See it and are simply grateful that He is Who He is and does what He does as He wills to do so. Who dares to second-guess the Creator? Only the fool.
Did Jesus pray for the whole world? Was He "all-loving" (from a human perspective and idea of "love") in that He hoped everyone would choose to accept Him?
Well, if you place your full faith and trust in the Word of God, you must say no. If you "depend on your own understanding", applying your own reason and inculcated traditional thoughts, then you will want to say "yes".
"My prayer is not for the world, but for those you have given me, because they belong to you." Jesus said as found in John 17:9.
"Peter has told you about the time God first visited the Gentiles to take from them a people for himself." --Acts 15:14
Do you contend with God? Do you challenge Him . . . arguing from your own light . . . that it is not "fair" or "loving" that He does what He will? Those who reason from their own light undoubtedly do and one of the first ways they go about justifying their opinion, which is contrary to the plain meaning of scripture, is to argue that the verses do not really mean what they say. "Did God really say you must not eat from any tree in the Garden?" the serpent craftily asks; and he is constantly asking seekers through worldly propositions "Does the Bible really say________?" in order to have them question the wisdom and will of God, supplanting THEIR OWN predilections in place of obedience to divine authority.
Where is it and at what point have so many denominations departed from the truth to land into selling a cacophony of errors? It appears always to be at the same point--in questioning the veracity, purpose, legitimacy of the Word of God. It is what launched Joseph Smith's "new revelations", what takes the Jehovah's Witnesses away, the Moonies, scores of "Christian" cults, the Roman Catholic church and all the liberal, world-loving errant sects in Protestantism.
Just because Paul said it, does it really mean that women are not to be in spiritual headship over men--to be pastors and heads of households? Just because Moses wrote and Paul reiterated it, does the Bible really say that homosexual practice is an abomination before God? Do "liars" really have their part in the lake of fire? "Does the Bible really say_______?" the serpent ever asks (until his final judgment.)
There is no shortage of unclean and familiar spirits, and of demonic partners and God-hating unregenerate human pontificators who will rush in to support the seeker who is having problems with God's holiness and sovereignty. The moment someone turns away from the cross and from Christ a hundred voices and enticements will surge in to fill the gap, and they are capable of producing "spiritual experiences" . . . "positive feelings" . . . "emotional and psychological encouragement" to win that wayward soul away hard and fast from the rock of truth, into the winding, shifting, morphing but colorful and plentiful illusions and mirages that would supplant the inexorable plan of God.
Bottom line, the unregenerate, fallen man or woman . . . hates God, hates truth but loves darkness and lies. But Jesus, Who is the one, true God in the flesh says, "My sheep listen to my voice; I know them, and they follow me." --John 10:27
Notice how the deceivers always assert above all that it doesn't really matter what you do or believe; God's uncritical grace is all there is, anything goes as ultimately ALL will finally reach The Kingdom. . . .
But the Bible states something quite different. To these charlatans and false teachers, many who claim to be in His service, He will say, "'I never knew you; DEPART FROM ME, YOU WHO PRACTICE LAWLESSNESS." --Mat. 7:23