Christian is an umbrella term that describes many differing sets of beliefs. This is an oversimplification but Protestants for example believe in Sola Fide, the believe that salvation comes from faith alone (https://en.wikipedia.org/wiki/Sola_fide), whereas Catholics believe that salvation requires "good works", the sort of thing you're likely thinking of. So ... different groups hold differing sets of beliefs with regards to what loving your neighbor means and what is expected behavior. This is a huge oversimplification, the "Salvation in Christianity" (https://en.wikipedia.org/wiki/Salvation_in_Christianity) and "Good Works" (https://en.wikipedia.org/wiki/Good_works) pages can help orient (or disorient) you.