Merry Meet Kenny and thanks for your question.
I think "organized" Christian Faith will fail and become extinct because it is an exclusive Faith and not an inclusive one.
If any organized Faith wants to survive they have to welcome people into their congregation and not find reasons to exclude them. That is exactly what organized Christians do to people outside their Faith!
I am a Christian, Wiccan, Shaman Witch. Now If I were to say that to an organized Christian themed church they would say that I can't be a Christian until I follow their rules. They would demonize me, try to invalidate me as a follower of Christ, shun me, and discourage my love for God.
How can Christianity survive when it tries to harass, manipulate and control prospective people it deems unworthy to save? The mentality of organized Christian religion is that "If you don't worship God the way we tell you to, you can't be a Christian in our church".
Another problem with organized Christian religion is the ignorance of other Faiths. If Christians understood people of other Faiths, they can relate to them more efficiently and find common ground. I'll give you some examples:
Christians believe that we should turn the other cheek, Wiccan's believe in Harming none that is the beauty of both Religions.
Wiccan's say the term "in Perfect Love in Perfect Trust" as A Christian, I saw that Perfect Love and Trust in God.
As a Christian I am not here to condemn you, I'm here to love you, which is similar to a Wiccan belief to do you will to harm none.
In the Christian bible passage of Luke 6: 35-36 it says
But love your enemies, and do good, and lend, expecting nothing in return; and your reward will be great, and you will be sons of the Most High; for He Himself is kind to ungrateful and evil men. Be merciful, just as your Father is merciful. This passage reminds me of the Wiccan three fold guideline to sow what you reap and what you give out to the Universe comes back to you times three.
Being able to understand the similarities between Christian and non Christian faiths is the only chance Christianity has a chance of survival, but Christians think they are somehow betraying God when they have fellowship with non Christians. There are even passages not to be of different yolks with people of different Faith's, and Christians think that gives them the right to demonize a person of a different Faith.
How can Christianity survive when it's members do everything in their power to drive people away from Christianity if they don't worship their Christian God the way they tell them? When a Christian starts telling people how to worship God, they cease to be Christian. Because they are trying to control and manipulate an individual's personal relationship with God and that is what is going to kill the organized Faith of Christianity.
I leave you with one final thought about the demise of Organized Christianity and sorry it will sound so harsh. I'm going to tell this in story form between my religion and organized Christian religion and honestly tell me which one you think will survive. I'll start the story with the Christian version of a young man that just moved to town deciding to take a walk where he passed by a Christian church and then walked by my church.
Pastor "Excuse me sir? Where is your ticket? We are having an outdoor church dinner that's by invitation only I need to see your ticket before you can join us.
Young man "Sorry sir, I just moved into your neighborhood and new here, I'm just taking a walk to get some exercise and enjoy the area, I didn't mean to trespass on your grounds.
Pastor "That's ok young man, you didn't know. As long as you are a Christian you can eat with us, but you need to be Baptised, promise to make a statement of Faith to our church, and agree to worship God the way we tell you!"
Young man "Um no thanks, I just want to go for a walk I didn't come for church.
Pastor "listen young man I'm making a great exception allowing you to eat with us but you have to sign this promissory note to eat with us before I can allow you on GOD'S property!"
Young man "Listen sir, I don't want to eat with your congregation. I'm not even hungry! I just wanted to take a quiet walk in the neighborhood when you rushed up to me asking for a ticket. I'm not even a Christian and I'm just walking on this public sidewalk when you came up to me and I'm leaving now."
Pastor "If you're not a Christian you better stay on that public sidewalk because if I ever catch you walking on our church grounds again, I'll have you arrested for Trespassing you Heathen!"
Needless to say the encounter with the Christian church really shook up the young man, but he was glad he got away unharmed by the hostile encounter with the pastor so he continued on with his walk. As he was walking the neighborhood he came up to our church and we were also having a wonderful outdoor dinner celebration too. I saw him walking very nervously by our church grounds and obviously ran up to him with open arms and a hug but he was startled!
Young Man "Listen mam, I'm not trying to cause trouble. I'm new to the neighborhood and just want to walk in peace ok!"
Me "I'm so sorry young man I didn't mean to startle you I'm just so happy to see a new person walking by and would be honored if you joined us for dinner this wonderful evening."
Young Man "Listen lady I'm not a Christian and I'm not trying to trespass on your land!"
Me "it's ok dear, you don't have to be Christian to be part of our family just be your wonderful self, we love you for who you are, that's all that matters to us."
Young Man "I'm sorry but I don't have a ticket to attend your dinner so I can't come"
Me "you don't need a ticket to come to our dinner, You're family now, and we are so glad you passed by."
Young Man "How can I be family, you don't even know me."
Me "It's ok, you can tell us all about yourself as you eat with our family, we can't wait to get to know you."
Young Man "Thanks for your generosity, but I need to get back home to my family now and help them unpack."
Me "Thanks for stopping by, I'm so glad to have met you. We have this dinner celebration every week and you and your family are always welcome here to eat with us, no tickets required.
If I happened to be new in town I'm going to check out the second church because they were humble and loving and not cruel and judgemental like the first church was. If a church can't see the human behind the religion they are doomed for failure and that's why their Christianity is going to die.