How that could be a "closed system"?
Jesus' voice is not contradictory.
Jesus voice is not contradictory with Himself, but your thoughts are not His thoughts!
And what are you asking with "How that could be a "closed system"?
I wrote "As for me I see Christianity as people who desire to follow Jesus Christ by listening to His voice spoken to them." - so are you asking if that could be a closed system?, or how might that be a closed system? but "How that could be a "closed system", is does not really make sense.
People have a choice - either to seeking Him and listen to Him with a belief that He is there for them or not. If you have a choice, it is not a "closed system" but is open to anyone who chooses to believe - or are you having trouble understanding this?
Someone might try and say that if a person doesn't believe in Jesus Christ then heaven in closed to them, which is true, but that is like saying a door that they can easily open is closed to them. All they have to do is open up to Him and they get Him, but they choose not to open up to Him, so they have control of the door and it is them who have closed themselves in.
In that sense, it is not that the church is closing anyone out, but that people are not letting themselves in. And if we think about it, that does often seem to be the case. Jesus Christ has many Christian churches with different options, styles, methods of worship, and so on, but some will not go into any of them, and still think that they are closed!
This reminds me of a time when the Lord had me working with a Catholic girl. She said her parents required her to go to church every week. And one day I went to talk to her about Jonah and the whale, and she looked blank when I brought it up. So I was like, "you know about Jonah and the whale, right?", but she didn't. Now the Protestant church my parents took me to as a child had certainly covered that Bible story with us kids then, so how could she, whose parents took her to church every week not know about that story?
So I got to thinking that maybe she was just pretending to go to church but didn't? And I then asked her if she had gone this last week, and she told me that she couldn't because she worked that Sunday afternoon and there was not a Mass in English that morning. "Ok, fine", I thought to myself. Then the Lord, via that small voice of His told me that 'He wanted me to go and ask the Preist there why he didn't have a Mass in English Sunday morning.'
OH MY - I thought. I had never been to a Mass at a Catholic church in my life, and so I dreaded it request. Never-the-less I took off to that church to ask. The church was big, old, and beautiful. I got there and was amazed to fine the main church 'OPENED'. Indeed the front doors were propped wide open! So I walk up and in, and found that nobody was there!! That is to say that nobody but the Holy Spirit was there, because I felt His presence the instant I walk through those doors. I was impressed, because while I had often felt the presence of the Holy Spirit in powerful ways, having regularly been attending a very Spirit filled Charismatic church at the time, where miracles and people passing out when prayed for often occurred, I don't recall ever feeling His presence so much when entering an unoccupied room.
So that church was not closed, it was opened, and more than any I had seen. Of course I need to talk to someone, a priest. So I headed to the office, and not wanting to ask a priest I ask the Lord if perhaps there was another way to handle this. And in fact, when I drove in the parking lot there was a sign that said they did have a couple of time Sunday morning where they held a Mass in English. So He told me that I could just ask someone for a brochure or something that had the times, and I could give that to the girl who was lying to me. It really wasn't about her lying to me, He explained, It was her lying to Him, that was the problem! You can pretend to others but not Him!!! That was the point that He wanted made!
So, if a person says that His church is a closed system, are they telling the truth? Are they not really lying to Him? If so, they shouldn't be surprised that He has someone call them out on it - for their own good!
He did not create a closed system but and open system, yet some are not willing to open up to Him!
BTW - That story had a rather sad ending, or maybe not?
It was finally discovered that she was participating in a gang that was stealing from that place of work. Over $30,000 was said to have been taken with her help, and she wound up in handcuffs and off to jail. That might have been a closed system for her. Still, the Lord was not. He had been trying to get her attention - standing there knocking at the door hoping she would open, even sending me to reprove her in hopes she might repent of her ways. So there was still hope for her, even after she would up in a "Closed System" known as a jail. So maybe, and I hope so, the ending will be good for her. That is my hope for all people!