To put it simply, Catholics use things they know to try to understand the things they don't. Catholics seek to know God and His work in the world through material things: water, wine, bread, oil, incense, candles, images, and so on. For Catholics, some of these things are more than just symbols -- they are sacraments. They not only point to God, they convey His power and grace to us through the mystery of the Church.For Catholics, this way of understanding the world, God, the cosmos, and everything is rich and multilayered. The Church is not only a symbol of the Body of Christ -- it is the Body of Christ. The bread brought forward by the members of the Body of Christ becomes itself the Body of Christ to feed the Body of Christ the Church. . .
Protestant theologians, rather than seeing how physical things and human culture connect us to God, emphasize the radical separation between God and the physical world. The Protestant focuses primarily on man's alienation from God, the fact of sin, the need for redemption, and the need for man's response. . .
Therefore, the idea that a visible church, a historic apostolic succession, a priesthood, and sacraments are necessary is -- at the very root of Protestant thinking -- alien and dangerous. For the typical Protestant, the Catholic Church is, by definition, worldly. Its very nature is materialistic and compromising with the world, the flesh, and the devil. For the Protestant there is therefore no relationship between Christ and culture. The faith is set up in dialectical opposition to the wisdom of man and the ways of the world.
It's great, go read it!