Truth in gods word is ever growing. Things people believe are correct may change eventually, but in the meantime they have faith that god will by his spirit will lead them into all truth and he will.
I don't think we can debate truth of gods word with faith. Faith is the evidence of things unseen, a promise that is yet to come.
Heaven is not dependant on how we deciphered genesis 3.
Now if we want to discuss false religious beliefs, not based on the bible, worshippers of the creation and not the creator then we can quite confidently say these people are strongly deluded and their faith is wrongfully directed.
but anybody professing jesus is god come to give salvation by repentance from sin, then there is always hope that the individual professing biblical basics in knowledge will grow to larger and correct truths and chances are, faith will be the vehicle to proper enlightenment.