This is all a feable attempt to change what the Bible actually says. Jesus said He is the only Way to heaven. Here is another one for you to try to explain away
Acts 4:12 NKJV
[12] Nor is there salvation in any other, for there is no other name under heaven given among men by which we must be saved.”
I am sorry I don't see a single mention of the word heaven in John 14:6. And even if it was there, it would not change the fact, the fact that early Christians, the "people of the way" were concerned with living a "Christ-like" way of life. Do you know what "Christian" means? It is a case where a group decided to "own the slur" as it means "little Christ". The early followers tried to follow Jesus's way, to be "little Christ". But of course the hole in all of this is that these "People of the Way", these "little Christ" are following Jesus decades before John is written so they probably weren't interpreting this passage since it wasn't known to anyone yet.
My contention all along is that the earliest Christian communities believed in, put their faith in a "way of life" first and the rest of the message followed. I don't believe that I am putting words into your mouth when I say that you suggest that you believed in the salvation first and then that changed your way of life. My entire point is that while this is great for you and those like you, that when it comes to converting those that don't believe in heaven or hell at all that they can believe in a "little Christ" way of life which may or may not lead them to greater faith.
While it still doesn't say explicitly heaven, you'd probably be better served with John 10:9. Either way, Jesus is the gatekeeper in these interpretation. If you reject my interpretation then it says nothing about how one should live their life prior to approaching the gate. It doesn't say that when one of the atheist here gets to the gates and says, "Wow you existed after all!" that isn't faith enough to get through.
Have you ever heard of the Apocalypse of Peter. I think you'd like it as it is one of the earliest, graphic descriptions of hell. And while its authenticity was already doubted, it was among the books in the earliest known list of the New Testament canon. And in the early days it seemed to be popular. By the time the canon was formalized it had fallen pretty much out of favor. While one can only speculate on why at this point, changes to later versions may provide a hint on why. You see in early versions when we reach end times Jesus goes down to hell and brings with him everyone to heaven. Later version he just brings the select few. Another reason it may have fallen out of favor is that it suggests that everyone spends time tormented in hell before that day Jesus arrives.
Other than the change in the story to align with how the proto-Catholics were taking the story, I'm not terribly interested because its hell is impossible to reconcile with a loving God which is what I'd like to believe to be the reason that it was dropped. "Like to believe", don't have much faith that this is actually true since hell is such big business and has been for quite a while.