This is a poorly worded question. Let me answer by saying nothing and everything.
Christianity as it’s supposed to be, according to the Bible, is correct. There’s nothing wrong with it.
What’s wrong with modern Christianity?
Oh, everything. I’m hard pressed to find anything right with it.
Everything in the epistle to the Laodecians applies to modern Christianity.
The early Christians searched the scriptures daily. Modern Christians barely open their Bibles.
Early Christians knew error, rebuked it, hated it. Modern Christianity tolerates it.
Early Christians avoided worldliness in all its forms, and clung to other like-minded believers. Modern Christians have become so worldly that you can’t tell the difference between churches and nightclubs.
Make a stand. Take a stand. Who is on the Lord’s side?
I am not your judge. I see things that are wrong, and I speak up, because that’s my ministry. That’s the job of EVERYONE in ministry. Are you in ministry? It’s your job.
But I tell you this – we shall all stand before the judgment seat of Christ. And we shall all have to give account. You’re saved, and nothing takes that away.
But if you’ve capitulated to error, I guarantee this – that gets no rewards. The Lord will not reward believers for something He hates.
1 John 2:15-17 (KJV) Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him. For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world. And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever.