Why do Christians blame the Catholic church for giving a bad name to christianity?

They use things such as the crimes committed by the church during the dark ages and what the priests do with abusing kids nowadays. While i agree that the church is responsible for these crimes , what about the other denominations which are guilty of crimes as well? Calvinist christianity ---- responsible for... show more They use things such as the crimes committed by the church during the dark ages and what the priests do with abusing kids nowadays.

While i agree that the church is responsible for these crimes , what about the other denominations which are guilty of crimes as well?

Calvinist christianity ---- responsible for upholding slavery in america
Dutch reformed church ----- Responsible for upholding aparthied in south africa
protestants ---- destroying ireland, killing aboriginal people of australia and native indians in america

so why blame only the catholics?
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