It depends on what you mean by "different."
Protestants and Catholics all worship the God of Abraham. So do Orthodox Christians and Jews and Muslims.
We do, however, have some different ideas ABOUT God, and about what he wants of us. But really, so do any two people in any of those groups. Even if they use the same words--perhaps a formal creed--to express their beliefs, the beliefs aren't exactly the same. Words aren't that precise.
Protestants have been separate from the Roman Catholic Church, and developing our own expressions of our beliefs independently from them, for over four centuries now, since they threw us out.