All men may hear and believe, but all do not believe (John 3:14-18). So you too have a gross misunderstanding of salvation.
This saying in John 3:14-18 is taken from Numbers 21:5-9. Israel (God's people) spak against God, and against Moses, and because of the disobedience of Israel, God sent poison snakes from the sky that would bite, and kill them. God instructed Moses to make a brass snake upon a pole, that when the people of Israel got bit, if they would look upon the poll they would be healed.
The brass serpent wrapped around a pole, is the emblem use by doctors and health care people to refer to healing.
Christ is the great physhion. When spiritual Israel looks to him for repentance, they are healed.
John 3:16 is the world of believers that God loves. Are the following worlds, the same world that God loves in John 3:16?
John 15:18-19 - If the world hate you, ye know that it hated me, before it hated you. If ye were of the world, the world would love his own; but because ye are not of the world, but I have chosen you out of the world, therefore the world hateth you.
John 16:19-20 - Now Jesus knew that they were desirous to ask him, and said unto them. Do you inquire among yourselves of that I said, a little while, and ye shall not see me, and again, a little while and ye shall see me? Verly, verly, I say unto you that ye shall weep and lament, but the world shall rejoice, and ye shall be sorrowful, but your sorrow will be turned into joy.John 17:9 - I I pray for them, I pray not for the world, but for them that thou hast given me, for they are thine.