Also read somewhere that initially Awans customs included many non-Islamic practices - making it harder to classify their religion, I don't think they are of Arab origins.
Yes.
Awans are exclusively Muslims. Even before Google my father told me that we are Qutb Shahi Awans, our ancestor is Qutb Shah who invaded India as a General in Mehmood Ghaznavi's army and later settled in Potohar region along with his sons.
Here is a brief info about Awans:
Who were Awans and how did they reach India? Sultan Hamid Ali writes in his book "Manaqib-e-Sultani" that Awans are descendants of Hazrat Ali Karam Allah Wajhul Kareem. When Sadaats (Holy Prophet's progeny through Hazrat Fatima Razi Allah Anha) left Arab due to troubles and started living in different areas of Iran and Turkistan, the Awan tribe helped them in that time of trouble, as they were their close relatives, that is why, their family name changed from Alvis and Hashmis to Awans which means "those who helped the Sadaats". Sadaats continued their religious obligations of preaching Islam, even when, they left Arab but Awans indulged in wars and battles and captured Harrat. Qutb Shah, the ancestor of Awans, died while he was the ruler of Harrat. The title 'Shah' is usually a part of the names of Sadaats but Awans also use this title.
When Sadaats migrated to Kharasan, Awans accompanied them and entered Punjab through river Indus and the mountains of Kala Bagh. Here also Sadaats remained cut off with material statuses and kept engaged in religious preaching, thus Bukharies in Uch Sharif, Gillanis in Bhot Mubarik, Shirazis in Chohan Saidan Shah and Hamadani Sadaats in Danda Shah Billawal guided people towards Islam and benefited them. While Awans captured Kala Bagh and occupied the Hindu forts of Malik Dhani, Potowar, Koh Pakharo, Valley of Son Sakesar, Koh Patao, Koh Tawa, Koh Khaon and settled here. The Hindus of these areas accepted Islam due to the influence of Awans. Now Awans are in majority in these Areas.
Professor Ahmad Saeed Hamadani has elaborated about Awans and their forefather Mir Qutb Shah in his book "Ahwal-o-Maqamat-e-Sultan Bahoo", he says:
"When Sultan Mehmood Ghaznavi left for India to attack Somnath, a troop of Alvis headed by Mir Qutb Shah (or Mir Qutb Haider) requested to accompany him. Sultan Mehmood allowed them and entitled them 'Awan'. Afterwards, they became known by this title…..Awans fought valiantly in this battle, so Sultan Mehmood was very happy with them. When they returned back, Mir Qutb Shah (or Mir Qutb Haider) requested Sultan to allow them to crush the Rajput landlords and Nawabs who ruled other areas of the country. Sultan accepted the request, so Mir Qutb Haider attacked the Janjuwas and Chohans who ruled the surrounding areas of present Potowar and Kohistan-e-Namak and drove them down the mountains. Awans captured and got settled in the beautiful valleys of these mountains. Now they were known as Qutb Shahi Awan".
Mir Qutb Shah is actually the person after whom Awans are called Qutb Shahi Awans. Under his leadership, Awans joined the army of Sultan Mehmood Ghaznavi and then settled in the valley of Saun Sakesar. Professor Ahmad Saeed Hamadani writes;
"Mir Qutb Shah's genealogy traces back to Hazrat Imam Mohammad Bin Hanfia Razi Allah Anhu, son of Hazrat Ali Karam Allah Wajhu. His ancestors helped and protected Fatmi Sadaats, fought for them and thus reached Afghanistan with them and settled in Harrat. Afterwards, they joined the army of Sultan Mehmood in his reign. The progeny of Mir Qutb Shah flourished in Potowar, they got the daughters of the defeated Rajas converted into Muslims, married them and had children. These newly converted Muslims and the tribes, who earlier came with Qutb Shah were now relatives, as they got inter married and had children. They related themselves to Mir Qutb Shah who was the source of link between them and the most famous and outstanding person among them. Even now, they call themselves Qutb Shahi Awans, wherever they reside. Although, it is known that Mir Qutb Shah lived in Anga in the Valley of Saun, Tehsil Naushehra, district Khaushab, Punjab Pakistan, but nothing about the year of his arrival, period of his stay here, year of death, or his shrine is mentioned by the writers".