That is all depends on personal interpretations or experience.
Which part of Bible should be read as literal? Which part as metaphor/allegory? Who decide that for all human?
Many religion say that only theirs is the correct one.
Yes, the concept is that if you accept jesus's salvation you can go to heaven. Accept salvation also means you're willing to abide by God's moral/law.
Different religion could have different moral/law which they interpret and they believe they're correct.
Oh, other believer don't follow my religion?
They accept jesus's salvation but their interpretation of God's clear and perfect moral/law is different than my interpretation/version?
They'll go to hell. They deserve it.
Only true believer who follow my true religion/God and the true moral/law deserve of heaven.
Exclusive religions...