Answered by Ustadha Mahdiyah Siddique
If a Muslim does not believe in Taqdeer (Destiny) is he or she still a muslim?
In response to your question;
One of the fundamental factors that Iman constitutes of is Destiny (Taqdeer), so for one to be a believer; belief upon this will also be mandatory.
In a Prophetic narration; Jabir narrates that the Prophet of Allah said: “You can never be a Believer; as long as you do not believe in Destiny — in its good and its bad — to such an extent that he believes whatever is to afflict him; he would not have escaped it and whatever is not to happen (misses him) will not occur (was not to ever afflict him)”. (Sunan Tirmidhi, Hadīth no. 2144, p.1867, Al-Kutub Al-Sitta: Darussalam.)
Only Allah Knows Best
Written by Ustadha Mahdiyah Siddique
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
This answer was collected from DarulIftaBirmingham.co.uk, which is run under the supervision of Mufti Mohammed Tosir Miah from the United Kingdom.