Not so.
The epitome of "muscular Christianity" was Theodore Roosevelt. It was a turn of the century movement that tried to arrest the degeneration of the upper crust WASP male into a kind of Henry James ineffectual bystander more comfortable in Europe than America.
Ah, Teddy...whadda guy! One of--if not THE--best presidents we ever had.
Too many people still view Christians as Ned Flanders when in reality more and more of them are closer to, say, Ted Nugent...and Teddy Roosevelt. :0)