The intersect tool takes multiple feature classes in the form of ["shapefile1.shp", "shapefile2.shp"] (quotes, brackets, and comma delimited). I'd try that.
Also, you cannot use single backslashes in folder paths, either preface them with raw notation or use double backslashes or single forward slashes ie "c:\temp" is wrong correct versions are r"c:\temp" "c:\\temp" "c"/temp"