There is no fundamental difference between them.? The difference is merely in the detail, and in the interpretation of ancient texts that were written for another culture and another time, and how to apply those texts to modern life.? All of life's paths are a path to God, whatever you conceive that to be.
truth is the path to god ,, by faith ,,, in jesus christ ,, the way ,truth and life !!
The truth of god may not be under any denomination or religion ,,cause the world is full of false religions ,, teachings ,, doctrines ,,
why ,, cause we live in the time of prophesy of the bible where false prophets and false teachers will abound ,,,
Catholics believe in the real presence of Jesus in the Eucharist. Read John Chapter 6: 22-59, Matthew 26: 26-28. We as Catholics also can trace our church back to the Apostles. Matthew chapter 16: 13-19 is also where we start with our line of popes. These are the biggest differences. The Lutheran church was started by Martin Luther in the 1500's because he had some disagreements with the Catholic Church much of which has been resolved. The Methodists were started by John Wesley during the Evangelical Revival in the 1700's. The Baptist's were started by Roger Williams in 1634 a separatist church from the Anglican Church or the Church of England started by King Henry the 8Th because the Catholic church would not grant him an annulment.
"What separates us as believers in Christ is much less than what unites us." (Pope John XXIII)
Almost all important doctrine is completely agreed upon between Catholic Christians and other Christians.
Here is the joint declaration of justification by Catholics (1999), Lutherans (1999), and Methodists (2006):
By grace alone, in faith in Christ's saving work and not because of any merit on our part, we are accepted by God and receive the Holy Spirit, who renews our hearts while equipping us and calling us to good works.
There are many minor doctrine issues and some major cultural traditional differences which, I believe, do not matter that much.
A Catholic worships and follows Christ in the tradition of Catholicism which, among other things, recognizes that Christ made Peter the leader of His new Church and Pope Benedict XVI is Peter's direct successor.
For more information, see the Catechism of the Catholic Church: http://www.usccb.org/catechism/text/index.shtml