Maybe he really is too inept to lead a band of homegrown terrorists.

The alleged ringleader in a plot to blow up two Riverdale synagogues — who’s claiming entrapment — revealed yesterday that he can’t even tie a necktie.

James Cromitie came to Manhattan federal court for a pretial hearing with a striped tie hanging loose around his neck.

“You don’t know how to tie a tie?” his lawyer, Vincent Briccetti, asked.

When Cromitie, smiling sheepishly, shook his head, his lawyer knotted the tie for him, saying, “It’s not that hard.”