The Jewish Encyclopedia has an article about ceremonial law which says (emphasis mine):
The issue between Reform and Orthodoxy hinges chiefly upon the view taken of the ceremonial law; the Talmudical conception of the Law knows of no such distinction as is claimed to exist between ceremonial and moral laws. The less important and the more important laws ("miẓwot ḳallot" and "ḥamurot") are rated alike (Yer. Ḳid. i. 61b; Tan., 'Eḳeb, 1). "Ceremonial laws must be obeyed as divine ordinances with unhesitating and unreflective obedience" (Yoma 67b), and "the wilful transgressor of any of the ceremonial laws is considered as a breaker of the law" (Ḥul. 5a). "Be as careful in the observance of the smallest commandment as of the greatest" is the ancient Mishnaic rule (Abot ii. 1). On the other hand, the fact is being more and more recognized that while certain ceremonies fall into disuse and others take their place, as has been the case with the sacrificial and Levitical laws, there are some ceremonies which form distinctive features of Judaism and must be upheld in order to keep it from disintegration.
It turns out that most mitzvas are impossible to keep. The Reformed position (as I understand it) seems simple enough: follow moral laws ("laws based upon reason") and perform ceremonies as possible. But if there's no distinction between ceremonial and moral law, how do modern people atone for failing to observe all laws?