As with all safeguarding matters, you must do something. You cannot pass it off as being “part of their culture” or worry about disrespecting the family’s beliefs. If you have concerns you must act and speak with your designated safeguarding lead.
While different faiths have different practices, the definitions of physical, emotional, sexual abuse and neglect still hold true.
It may be that you do not feel that you have enough knowledge or experience of a particular faith or belief, but this should not delay your acting. There is still a duty to keep the child safe, but when dealing with any allegation of child abuse linked to faith or belief, agencies must engage with individuals, families and in some cases faith or other communities to challenge the belief that underlies the harm. You may have a role in this, however your primary focus remains the child.