gistfile1.php

<?php
class Some_Child_Theme {


	public function __construct() {
		$this->hooks();
	}

	public function hooks() {

		add_action( 'genesis_setup', array( $this, 'genesis_setup' ), 15 );
	}

	public function genesis_setup() {
		remove_action( 'genesis_header', 'genesis_header_markup_open', 5 );
		remove_action( 'genesis_header', 'genesis_do_header' );
		remove_action( 'genesis_header', 'genesis_header_markup_close', 15 );
	}
}
new Some_Child_Theme;