The single best argument for there having been a creation event in the past is that "The present is the key to the past". Only intelligence has been observed to form the types of complexity that could even hope to be causal to what occurred in the past that we can observe in the here and now.
There has been no empirical scientific evidence produced to back a hypothetical POV that the complexity of life formed by non-intelligent causes which does not itself require the same or greater level of belief and faith as any current religious view.
And this is false. We know from multiple simulations that high levels of complexity spontaneously arise when there are three tings: 1) reproduction, 2) mutation, and 3) selection. No intelligence needs to exist to promote that complexity; just those attributes.