Not Even Sponges Came Early

 "The evidence for sponges from Precambrian strata iscircumstantial, often based on confirmation bias, and lackstesting of valid alternative non-animal hypotheses."

So concludes this comprehensive 2014 study of the seventeen instances of claims for Pre-Cambrian evidence for sponges. Instead, it turns out the first solid evidence we have for the appearance of sponges is the Cambrian, as with every other phyla of life alive today (and a good many which have gone extinct). 

So far as I know, there has been no evidence uncovered to refute this conclusion in the last seven years. The Cambrian Explosion is indeed an explosion. Whatever the mysterious Ediacaran forms were, the body plans which fill our world today show up within an astonishingly short period of time by evolutionary standards. How did nature prodcue new forms and change orders of magnitude bigger and faster than we see today? The creationist answer is that nature had help. 

Also see this study. 240 million years of missing glass spicules. The DNA and other evidence suggests that sponges should have been around, producing spicules, 240 million years (at least) before we find them. Of course life forms showing up way later than they should based on the distance in their genes is very common and very large problem in the early Cambrian. I would call it a biomarker for Divine Intervention.