Here in the US, they tend to target abortion providers:
* Dr. George Tiller was shot and killed by anti-abortion terrorist Scott Roeder in 2009.
* James Barrett murdered abortion doctor John Britton and his bodyguard James Barrett in 1994. He was executed for his crimes and is considered by some a martyr.
* Eric Rudolph, who was the Olympic bomber who killed Alice Hawthorne and wounded 111 others in 1996. He also detonated bombs in an abortion clinic that killed Robert Sanderson in 1997.
As for organizations, I would also include:
* The Army of God, for their support of people who killed above
* Westboro Baptist Church, for their inflammatory rhetoric
Very close to home, in 2012 white supremacist Wade Michael Page killed Sikh in Oak Creek, WI thinking him to be Muslim. While it's not clear that Page was Christian, he certainly was not Muslim or Jewish.
Non-US Terrorists include Jospeh Kony and Lord's Resistance Army.