I've read and studied the Bible all my life. It is a book written by men who claimed to have been inspired by God, but I do not believe it is the complete or explicit word of God. I do not believe that Jews and members of other religions will be thrown into a lake of fire. "My Father's house has many mansions." Christ is not the *only* path to heaven, despite the words of men claiming to know the word of God.
Exactly, that is what OT 'the law' taught us. That it is impossible to work one's way into heaven. Jesus paid the price for us, through his grace, his way, not our deeds, and he will bring us home one day. There is one road to these mansions, (not many roads to the mansions). When we think we have done good deeds to get into heaven, we have pride in our works, not in Christ's completed work on the cross.
But, as it is written also, for us not to use the grace as a reason or an excuse to continue on sinning.