Well, entering Heaven is more than having faith in God. Faith without acts is something that is like fire without oxygen - it can't exist. Bible Verses for this are: James 2:17: "Thus also faith by itself, if it does not have works, is dead and James 2:26: "For as the body without the spirit is dead, so faith without works is dead also."
And now, what do I mean by faith... is not the exoteric view but rather the esoteric view. I for one am an Unitarian Universalist. My belief is based on a lot of teachings from Judaism and Christianity (all Abrahamic religions btw). Notice the connection? Abraham, the first prophet of God and then the two first major religions? I practice a lot of occultism and spiritual practices, each with their own views of the underworld, some even more complex than the idea of St. Peter guarding the gates of Heaven (thing itself which is more complex as well but more on that later on in this post).
If I don't help the poor, be kind, have a humble and honest heart that is devoid of hate and irrational thoughts of rage, etc. then Heaven would be a place that I would hardly reach. Faith alone needs to be accompanied by having the qualities I described as they are representative of a model of living, not just mere qualities.
The first model of great qualities for the afterlife, in my opinion, comes from the Egyptian 42 commandments of Ma'at / The Goddess of Order and Justice and I cite them here:
- I have not committed sin.
- I have not committed robbery with violence.
- I have not stolen
- I have not slain men or women
- I have not stolen food
- I have not swindled offerings
- I have not stolen from God / Goddess
- I have not told lies
- I have not carried away food
- I have not cursed
- I have not closed my ears to truth
- I have not committed adultery
- I have not made anyone cry
- I have not felt sorrow without reason
- I have not assaulted anyone
- I am not deceitful
- I have not stolen anyone's land
- I have not been an eavesdropper
- I have not falsely accused anyone
- I have not been angry without reason
- I have not seduced anyone's wife
- I have not polluted myself
- I have not terrorized anyone
- I have not disobeyed the Law
- I have not been exclusively angry
- I have not cursed God / Goddess
- I have not behaved with violence
- I have not caused disruption of peace
- I have not acted hastily or without thought
- I have not overstepped my boundaries of concern
- I have not exaggerated my words when speaking
- I have not worked evil
- I have not used evil thoughts, words or deeds
- I have not polluted the water
- I have not spoken angrily or arrogantly
- I have not cursed anyone in thought, word or deeds
- I have not placed myself on a pedestal
- I have not stolen what belongs to God / Goddess
- I have not stolen from or disrespected the deceased
- I have not taken food from a child
- I have not acted with insolence
- I have not destroyed property belongings to God / Goddes
Although the list of Laws is lengthy, it resembles the way one should behave to have a good life and enter Heaven:
have a calm mind, a good and humble heart, avoid committing adultery, murder and other crimes / transgression, help others, avoid at all costs committing blasphemy.
Slightly different but very important to the topic we have the Ten Commandments of God:
- I am the Lord thy God, thou shalt have no other Gods before me. (Note: this refers to addictions, vices and not Gods / Elohim)
- Thou shalt not make unto thee any graven image (Note: this is intended for not worshipping what is known as thoughtforms / mental projections of Ego or what our brain imagines for the moment)
- Thou shalt not take the name of the Lord thy God in vain (basically related to not committing blasphemy)
- Remember the Sabbath day to keep it holy. (That is the case for Hebrew people but you need to respect the days that are Holy based on your belief system as well as the Holy days of other belief systems)
- Honor thy father and thy mother. (This refers both to the parents one has / had, and also the Cosmic / Esoteric aspects of the Divine Masculine and Divine Feminine)
- Thou shalt not kill
- Thouh shall not commit adultery
- Thou shall not steal
- Thou shall not bear false witness
- Thou shall not covet (Rest of these 5 are deeply connected with the 42 Laws of Ma'at)
Now when it comes to Peter, the concept of Gate keeper is something that relates more than just the image of Peter, the Bearded Saint that guards the Pearly gates. Saint Peter is acting more as a Divine Judge in mainstream Christian tradition, but in apocryphal writings such as Apocalypse of Peter, we have St. Archangel Uriel standing as the Divine Judge at the pearly gates. This can be interpreted as Human (Peter) evolution through Higher Wisdom (Archangel Uriel). Achieving great spiritual evolution can help one live a good life and reach the Pearly Gates.
As for the Bible verse Matthew 16:18–19, it states specifically that in some way we are responsible for what we are doing in this life. This is also further acknowledged by other verses such as Galatians 6:7: "Do not be deceived: God is not mocked, for whatever one sows, that will he also reap." The verses Matthew 16:18–19 also relates in my opinion to the Hermetic principle of vibration, whereby the power of our thoughts and words can shape the reality that we live in, of course, taking into consideration external factors that are not in our control.