Hey, great question. Many of us are saddened by the state of the Church today. I think the most honest answer is that Jesus, Paul, Peter, and the book of Revelation predict that the Church will be weak and apostate, especially in the End Times (which there is no way to know if we are there or not). Here are some of the texts about it:
- Lukewarm. Rev. 3.14-22
- Faithless. Lk. 18.8
- Perilous times. 2 Tim. 3
- A falling away. 2 Thes. 2.3
- Evil men and seducers. 1 Tim. 4.1; 2 Tim. 3.13.
- False teachers, judge-worthy heresies. 2 Pet. 2.1-3
- They will not endure sound doctrine. 2 Tim. 4.3-4.
I'm trying to think if there is
any text telling us that the Church will be strong. About the only one that comes to mind is Matthew 16.18: "on this rock I will build my church, and the gates of Hades will not overcome it." But that doesn't really say the Church will be strong, only rather that the true Church will never disappear from the Earth.
Jesus Himself said that there would only ever be a few faithful and truly committed ones (Mt. 7.14; Lk. 13.24)
When we think back to ancient Israel, we remember that only 2 of the Exodus generation entered Canaan. All of the others were apostate. When we think to the divided monarchy, the northern kingdom of Israel didn't have a single godly king, and apparently rather godless people, and the population is lost to history at the hand of God's judgment. The southern kingdom of Judah did a little better, but not much.
The real strength of Israel was in the remnant that God promised to preserve in the midst of all the nominal God-worshippers and the hypocrites. So today, the real strength of the Church is in the remnant of true believers, not in the vast pool of cultural Christians.
Think through Church history, and we are hard-pressed to think of many times when the Church was strong. They endured times of intense persecution in the first few centuries, struggling for survival while they grew. When Constantine approved of Christianity, the Church became culturally acceptable, and therefore also weak and compromised. During the Islamic invasion of the latter half of the first millennium, the Church went underground, so to speak, in the monastic movement. Then there's the era of the Crusades ('nuff said), followed by the atrocities of the Medieval Church for several centuries. So when has the Church
ever been strong?
Even today, the Church in Europe is failing. The Church in Africa seems to be large, but at the same time unable to overcome one terrible dictator after another. The Church in America is fat and lazy. The Church in China is persecuted and underground.
The question at hand is: Is this evidence of the false value of Christianity or of the falseness of its teachings? I think not, though it would seem such to an outsider. For the true remnant, Christianity has peerless value and is the very expression of foundational and objective truth. And that is what is fundamentally true about Christianity. The fact that Christianity predicted its own weakness and apostasy shows that this is no ruse or failure, but is part of its very fabric. It's part of the very nature of Yahwism (including its fulfillment in Christianity) that it will be grasped only by the dedicated few despite its general widespread generic appeal. An illustration of this is the large crowds who came to "follow" Jesus at the feeding of the 5,000. Great widespread generic appeal. But when Jesus explained what his movement was truly about (John 6), they all bailed except a few (Jn. 6.66). This has always been the teaching of Christianity: Truth will only be recognized by a relative few—those who truly seek it.
I think the Bible's brutal and authentic honesty about such things gives it credibility, not ill-repute.