The history of Protestantism can be summed up simply as a history of wrongs. In 1517 Martin Luther says to the Catholic Church "you're wrong." Thus began what is now known as the Lutheran church and the Protestant reformation. A couple of decades later Zwingli and Calvin say to Martin Luther "you're wrong" and begins the reformed churches. John Knox, a few decades after Calvin and Zwingli, says to Calvin and Zwingli "you're wrong" and founds the presbyterian church and later the Church of Scotland.
In 1525 Grebel and Muntzer say to Martin Luther "you're wrong" and founds the anabaptist faith. Menno Simons says that Grebel and Muntzer are wrong and in 1537 founds the Mennonite church. About a century later Jacob Amman says to Grebel and Muntzer "you're wrong" and begins the Ammish faith.
John Smyth too says to Martin Luther "you're wrong" and founds the Baptist church in 1609. William Miller, 250 years after Smyth, says to Smyth "you're wrong" and founds the Adventists church and then eventually the seventh day Adventists follow there after.
George Fox, not liking Martin Luther's theology, says to Martin Luther "you're wrong" and establishes what will be known as Quakerism in 1648.
Off the main land of Europe, Henry VIII says to the Catholic church "you're wrong" and founds what is today known as the Anglican church in 1534. About 200 years later, John and Charles Wesley then say to Henry VIII "you're wrong" and found the Methodist church. Others think Wesley to be wrong and the Holiness Church's are found, which leads to the establishment of pentecostalism because someone thought the Holiness Church's we're wrong. Pentecostalism eventually gives birth to the Charismatic and non-denominational church because some thought the Pentecostal faith was wrong.
In 1534 Robert Brown says to Henry VIII "you're wrong" and founds Congregationalism.
How can Protestantism claim to be inspired by the holy Spirit if none of the founders of the major denominations and even many of the modern spinoffs and evangelical church's claim that other christian expressions and faiths are doing it wrong? How can Christ's church be one when many of the Protestant denominations cannot agree on simple teachings of the faith: are there seven sacraments or only one; can infants be baptized or only consenting adults; faith alone or faith and works; scripture alone or scripture plus tradition? Did Christ promise that the gates of Hell would not prevail against the Church of Luther or the Church of Wesley or the Church of England?