2Pt3

The Lord is patient and does not want any to perish, but rather for all to repent and believe. If God's desire is for everyone to be saved, then why are so many lost? In fact, most according to scripture will be lost. Forever.

There are several answers to this question, but I believe the most biblical answer is simple. God's love makes a provision for all, but His justice requires judgement for all who reject Him. God can not suspend any of His attributes to make provision for another one. He has to be all loving and just at the same time. To reject Jesus is the only "unpardonable" sin. 

The believers Peter was writing to were suffering because of their faith under a ruthless and godless leader. Yet, it is in this context that Peter is expressing God's patience and desire that all would be saved. God's love is amazing.