Dalits are dalits whether they belong to Hindu or Muslim or Christian religion. They are victims of centuries old Casteism, which robbed them off their liberty, wealth & self-esteem, and reduced them to social outcasts.
The benefits of reservation belong to them too.
If dalit Hindu & Muslim can be in Reservation, surely, then a Dalit Christian must enjoy those same benefits.
You can't simply hide behind Religious farce & wish them away.
They are more Indian than any foriegn Aryans Hindus, if not equal.