Sindooram

Disclaimer: I am not a religious bigot and this post should be taken as just a curiosity.

I am baffled by seeing the theft of Hindu identity by people of another religion. At an ideological level they claim superiority by proclaiming to not follow idolatry and polytheism. For such individuals Hinduism is an archaic religion full of mumbo jumbo.

But that doesn't stop people from the same faith adopting Hindu customs like putting sindooram(Vermillon) on their forehead, adopting Hindu first names, placing traditional Hindu vilakku with some minor modifications in their homes and places of worship, performing traditional Hindu dance forms with minor modifications etc.

Can someone please explain why this fetish with adopting Hindus customs??