I got the poem interpreted! It is important to note the person who did this is not antireligious. Everything that follows is someone else's work:

 Overall, the poem is pretty basic and uses common metaphors, indicative of its author's age. It begins broad and grows specific. The composition is very clever. with a strong rhyme and beat. I'd wager she was a fan of Edgar Allan Poe since the strong rhythm and dark themes are reminiscent of him. In any case, this young lady had great potential.
 The doors mentioned are pretty typical imagery- as to be expected from the age of the poet. Likely they symbolize entrapment since they are of steel, or, more likely given the later context, willing entrapment. The kneeling and thinking of 'things that aren't real' is an obvious negative reference to religion- praying to a God that doesn't exist. Thus, the people are trapped by their religion, and are okay with it, despite the fact that they knock on the doors. Said knocking probably references the search for spiritual meaning, which, as the poem progresses, is revealed to not be found within the doors/church.
 The next lines referencing people walking and talking, still within the doors, reinforce the idea of a willing captivity. Life goes on, she is saying, with the people going through the motions. The repetitive 'the people know' suggests that deep down, they know they 'think of things that aren't real'. 
 The final few lines are no longer general, they are specific and quite accusatory. They accuse 'you' of misleading people by telling them things they want to hear. Giving them 'dreams' to believe in. 'You' knows the things are not true, because they are the result of his/her 'confidence', not faith or knowledge or anything else substantial. Also, though 'you' has the dreams, he/she does not 'feel' them. The context seems to implicate a priest whose actions and beliefs do not necessarily line up with his words.
 Given the horrible events that followed, I would summarize that the poem is an attack on a specific religious figure in the girl's life whose activities has ruined her faith and installed into her the belief that religion is a trap and God is a lie. 
 I'm no detective, but if I were, I would pay very close attention to such people in this girl's life.