I wouldnt do it, ask AI for some calculations on what you are trying to hold and at the depth you are trying to hold back and youll find out it isnt practical or possible, i suspect you could do it with enough material behind it but in that case you'd just as soon leave the cinder blocks out and do it properly. Cinder blocks will allow for movement and seepage, it wont last long in my estimation...but then again try it and please report back on the results!
