All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah and that Muhammad is His slave and Messenger.
The statement cited by Al-Qaasimi on the authority of Ibn Al-ʻArabi is correct and this view has been established by many scholars. When a Muslim commits an act of disbelief entailing taking the doer out of the fold of Islam, be it a statement or act, he is not declared a disbeliever unless the due conditions of takfeer (declaring a Muslim individual or group non-Muslim) are met and the impediments to it have been eliminated.
Some scholars made an exception with regards to the Muslim who openly rejects apparent and established prohibitions while living among the Muslims. In this case, he is not excused because of ignorance. The same applies to the person who commits blasphemy against Allaah, The Exalted, or the Prophet for instance.
We have previously detailed this topic in fataawa 39870, 91372, 23340 and 17875.
Allaah knows best.