That’s mainly a difference of definition, then. Christian; in my mind, just means you believe in the divinity of Jesus Christ and worship him.

Copy-pasted from Wikipedia;

In 1933, prior to the annexation of Austria into Germany, the population of Germany was approximately 67% Protestant and 33% Catholic; Jews made up less than 1% of the population.[1] A census in May 1939, six years into the Nazi era[2] and incorporating the annexation of mostly Catholic Austria into Germany, indicates that 54% considered themselves Protestant, 40% Catholic, 3.5% self-identified as “gottgläubig” (lit. “believers in god”, often described as predominately creationist and deistic),[3] and 1.5% as non-religious.

So by your definition of Christian, it’s still the case that most Nazi soldiers were Christian. So I would say my original statement still applies, and there were Christians that didn’t believe “in loving everyone, even their enemies.”