Alia Bhatt is the daughter of Mahesh Bhatt and Soni Razdan. According to Wikipedia, she is a British actress and singer of Indian descent who works in Hindi films.
Bhatt is a surname of Kashmiri origin (Kashmiri Pandit). Mahesh Bhatt was born to Nanabhai Bhatt and Shirin Mohammad Ali. Bhatt's father was a Hindu Gujarati Brahmin and his mother was a Gujarati Muslim of Dawoodi Bohra background. So, Bhatt is half Hindu and half Muslim by birth.
Alia Bhatt's mother and second wife of Mahesh Bhatt, Soni Razdan was born to Gertrude Hoelzer, a German, and Narendra Nath Razdan, a Hindu Kashmiri Pandit. So, Soni Razdan is half Hindu and half German by birth.
In the 1970s, Mahesh Bhatt became a follower of Osho, and later found spiritual companionship and guidance with philosopher, U.G. Krishnamurti. Bhatt calls Krishnamurti his lifeline and says "Take him away, and I am empty".
While it is not evidently known, but the family is quite a secular one. Mahesh Bhatt, though a follower of U.G. Krishnamurti, is often seen using Islamic words and Alia is seen saying 'Inshallah' many times. Some say Mahesh converted to Islam to marry her second wife.
Coming to Alia Bhatt, she comes across as secular who respects and follows every religion like many of us. Apart from that, she is a humble and sweet human who is reaching heights of success with her caliber. It is very much known how she worked for her first break and decided not to debut with her father. She is seen making sound decisions and her public appearances also are decent and controversy free till date. Her latest movie Raazi is liked by critics and is running good.