"For God loved the world in this way: He gave His One and Only Son, so that everyone who believes in Him will not perish but have eternal life." (John 3:16 HCSB)
"For this is the way God loved the world: He gave his one and only Son, so that everyone who believes in him will not perish but have eternal life." (John 3:16 New English Translation)
It does not say:
1. that everyone will be saved.
2. that all have the same opportunity to be saved.
3. that all could potentially be saved.
4. how anyone comes to believe.
All it says is that those who do believe will have eternal life.