Who has put God in a box? Not I.
Did not Peter entertain Satan?
Is the sin of Judas any greater than the sin of king David?
Can the blood of Jesus cover the sin of all three?
You are the one putting God in a box.
God can or will save only those who will do/believe/choose certain things according to you.
God will save according to his will.
When his disciples heard it, they were exceedingly amazed, saying, Who then can be saved? But Jesus beheld them, and said unto them, With men this is impossible; but with God all things are possible.
You do not even understand the scripture you are quoting. The reason the disciples were amazed is because people believed being wealthy was a sign that a man was in God's favor. Likewise, when a man was poor or sick like Lazarus who laid at the rich man's gate, they believed this was evidence that this person was very sinful and under God's wrath.
Mat 19:23 Then said Jesus unto his disciples,
Verily I say unto you, That a rich man shall hardly enter into the kingdom of heaven.
24 And again I say unto you,
It is easier for a camel to go through the eye of a needle, than for a rich man to enter into the kingdom of God.
25 When his disciples heard it, they were exceedingly amazed, saying, Who then can be saved?
26 But Jesus beheld them, and said unto them, With men this is impossible; but with God all things are possible.
27 Then answered Peter and said unto him, Behold, we have forsaken all, and followed thee; what shall we have therefore?
28 And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.
As you see, the disciples were amazed because Jesus told them very few rich men would enter heaven. This was the exact opposite to what they had always been taught and believed.
So you are absolutely misusing this scripture, it does not mean what you think it means at all. Men have choice, Peter exclaimed how they had forsaken all to follow Jesus, and Jesus tells them they will sit on twelve thrones.
This scripture is not teaching Unconditional Election whatsoever, just he opposite.