For the most part, Liberalism is theologically at odds with Christianity. I mean, who are you referring to precisely? Episcopals, Methodists, or Presbyterians?
Listen. punk. My grandmother died of typhoid in China. Presbyterian missionary. My grandfather died of beheading/gunshot in China. Presbyterian missionary. My mom and dad spent three years in a Japanese prison camp in World War II - Presbyterian missionaries. She later caught polio
in Japan as a Presbyterian missionary and died when I wes three. My dad came back to the US as a Presbyterian minister and preached for racial equality in 1961 or so in Arkansas. They, by all accounts, were pretty nice folk.
Don't attack other members of your faith who don't seem to you to be as Ideologically Pure (TM) as you are. They just might possibly be Christians, too.