Well first off your wrong. The Anabaptists were always separate from the Catholics. The initial churches did not have the kind of hierachial government that the Catholic church has. And the Orthodox catholics split from the church at Rome long before the Protestants did. And it's the Roman Catholic church that changed over time, getting away from the gospels and embracing evil doctrines that eventually caused the Protestants to separate. Even the Catholic church admits that it's leadership was evil during some of those times. That's why they call them "anti-popes".
It is sad, Jesus prayed for unity among the believers. But there is more unity among the believers than you are giving them credit for. Most Christian denominations agree about the most important doctrines the nature of God and the nature of Salvation. And they acknowledge that the other denominations agree on those important things. Everthing else is relatively minor.
Now there are some groups that claim to be Christian but change the nature of salvation or the nature of God. Mormons, Jehovah Witnesses are a couple of these. Most Christians organizations distance themselves from these.
The scripture however hasn't changed. And it's the scripture that keeps us mindful of what is important. When you see groups like this embracing homosexual leaders, it's because they have ignored the scripture, not unlike the Catholic church did way back in the 1600's.