"There are some upon this of yours... who lay claim to know us, and who do their deeds of passion, pride, ill-willed, hatred, envy, bigotry, and selfishness in our name, who are as strange to us and all our kith and kin, as if they had never lived"
Scrooge believed that the Ghost was God, or related to God
The Ghost is saying that, although people call themselves Christians and know God, they act in ways that contradict Christian beliefs and "what they lay claim to"
The listing of the sins builds up on each other, creating an overwhelming effect on the reader. Through the voice of the Ghost Dickens hints that Christianity does not necessarily mean morality