Indonesian Muslims

Assalamualaikum brothers and sisters. I had a question about Indonesian Muslims. I am part of multicultural Muslim community where I'm involved with Muslims belonging to almost every nationality. I've traveled quite a bit as well and have interacted with multiple Muslims from Africa, Middle East, South Asia and Balkans. Throughout my interactions the one community that has inspired me the most are Indonesian Muslims. I haven't seen any other ethnicity as pious, as practising, as devote to Islam as these people. Their respect for their family, for their religion and the people around them has truly left me astonished. Is there a particular reason why Indonesian Muslims are this way ? Is it like a different of culture upbringing ? Or is this just my experience? I'm really curious as to how can people belonging to the same religion can be so alike yet so different at the same time.