In your mind Christianity and faith are interchangeable, although faith does not necessarily imply Christianity. Faith is a belief in something that can't be pr oven to ones satisfaction. In a way you have faith that men landed on the moon. (Or you don't, and you've come up with elaborate explanations of the hoax used to convince others to believe.)
People just aren't able to generate meaning and purpose for their lives, by themselves. When they try, it winds up being either something totally selfish, or very limited and insignificant. Religious faith gives meaning to people's lives, and Christianity is the only one that gives adequate answers to the deep questions about the worth of human existence, the real difference between good and evil, the difference between Man and the inanimate, the origin of personality, and so forth.
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Christianities influence isn't fading. The faith is growing at proportions not seen since the great revivals. Admittedly it's growth rate in the US has slowed some, but even here the number of new Christians increases every year.
There have at sundry times been dark spots as the Soviet Union was but Christianity never stopped growing in other parts of the world and now it is retuning in mass over there.
Even now there are dark spots caused by liberalism and the growth of Islam(promulgated by increased oil based wealth) but the tide will return to those spots also,
Christianity is not the only faith. In general, I would like to say no that the world will just turn to other faiths. However, I would like to point out that for the world to single out a faith (Christianity) to remove above all others, leads me to believe that it possess something a lot of people fear/dislike. We as a country don't hate the Muslim religion that attacked us as much as we hate Christianity. It has my curiosity up. But I must also add that the persecution of various religions has occur ed through out history.
Actually, Christianity is not fading, it is GROWING! It is pr oven that Christianity is the number one religion shown all over the world. Also the founders of the USA were Christians. Don't give up on your faith. Stand strong in the Lord and always look to him in hardships!
The bible quotes Jesus as saying, ( Only through me will you get to Heaven.) Not through Mohammed or Abba etc. Jews don't believe that Jesus was the Messiah. Yet they are God's chosen people. I believe that Christianity is the only real religion. Every one of us is given the same measure of faith. Faith is like a muscle. God puts us through trials to strengthen our faith. Read Hebrews 11, read how many times God says, "it was by faith..."
We all have faith in something. You can't avoid faith. An atheist actually has an abundance of faith. They believe there is no God contrary to all the evidence that exists in the world in which they live. What do you believe???
If you think the influence of Christ is diminishing then perhaps you should think again. More people are hearing the Word and coming to faith than ever before.