You doesnt understand religion .
Iman-e-Mufassal
There are seven (7) essentials to basic Islamic faith not believing in one of these essentials a person remained outside the fold of Islam
1. Faith in Supreme Creator ;
2. Faith in His angels;
3. Faith in all of His messengers or Prophets;
4. Faith in His revealed Books;
5. Faith in the Last Day or the Day of Judgement;
6. Faith in the unseen,
7. Faith in the life after death.
Ancient Rig vedic tribes do believe in all this , actually Indians and Arabs are having same religion