The Westminster Confession of Faith: 1643
As God hath appointed the elect unto glory, so hath He, by the eternal and most free purpose of His will, foreordained all the means thereunto. Wherefore, they who are elected . . . are effectually called unto faith in Christ by His Spirit working in due season, are justified, adopted, sanctified, and kept by His power. through faith, unto salvation. Neither are any other redeemed by Christ, effectually called, justified, adopted, sanctified, and saved, but the elect only.
The rest of mankind God was pleased, according to the unsearchable counsel of His own will, whereby He extendeth or withholdeth mercy, as He pleaseth, for the glory of His Sovereign power over His creatures, to pass by; and to ordain them to dishonour and wrath for their sin, to the praise of His glorious justice. (Chap. III — Art. VI and VII)
One can certainly deny the truth of the above, but it seems rather difficult to make the claim that double predestination is not taught therein. Does this make God the originator of evil and sin in man? No.
The Second Helvetic Confession: 1566
Finally, as often as God in Scripture is said or seems to do something evil, it is not thereby said that man does not do evil, but that God permits it and does not prevent it, according to his just judgment, who could prevent it if he wished, or because he turns man’s evil into good. . . . St. Augustine writes in his Enchiridion: “What happens contrary to his will occurs, in a wonderful and ineffable way, not apart from his will. For it would not happen if he did not allow it. And yet he does not allow it unwillingly but willingly.” (Art. VIII)