While there are undoubtedly Christians, or at least potential Christians, within the Catholic church, there is nothing but tradition to suggest that this organization is indeed the church that Christ founded.
The Church that Christ founded is characterized not by which organization one belongs to, but it is a spiritual entity. It's members are those who have the spirit of Christ dwelling in us.
Nothing but tradition and two thousand years of history and the Gospels. That's all.
Yes!
The Catholic Church.