So you have assumed the powers of God by deciding about Eman of Muslims?
Muslims do many wrong deeds and acts all across the globe. Some Muslim are good some are bad, some are doing small mistakes while other are involved in horrendous acts. Killing innocent civilians and other terrorist activities are the worst kind of crimes and terrorist will suffer their consequences in this life and the afterlife. However, if a person believes in one God, finality of Prophet and is not openly rejecting pillars of Islam then he is a Muslim. And no one has the authority to declare him Non Muslim. If someone has committed Gunah e Kabira then this act doesn't make him a non Muslim. Doors of repentance are always open on a Muslim. On the one hand you criticise "Takfiris" while one the other hand you people are supporting their stance by declaring that all extremist are "Kafir". This is the belief of Khwarij"that committers of "Gunah e Kabira" are kafirs.
"Takfirism" should be rejected in all its forms and manifestations and we should always adopt a middle path.