That is partially correct. But let us read vs. 17 "in context" vice "in isolation."
John 3;17 “For God did not send the Son into the world to judge the world, but that the world MIGHT BE be saved through him.
NOT "will be saved." Now let us read the verse "in context."
John 3:17-20
(17) For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
(18) He that believeth on him is not condemned: BUT he that believeth NOT is condemned already, because he hath not believed in the name of the only begotten Son of God.
(19) And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
(20) For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.
Let us not forget what Jesus said in Matthew 7:23.
Matthew 7:21-23
(21) Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
(22) Many [NOT a few] will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
(23) And then will I [Jesus] profess unto them, I never knew you: depart from me, ye that work iniquity.
When Jesus says "never" He not mean someday by and by.