How Deep Should My Research Go?

So, I've recently started working on a writing project that heavily involves gods from several different pantheons (Greek, Egyptian, Celtic, etc), but I hit a snag yesterday. There are several gods on the list of ones that I wanted to focus on characterizing, but I'm starting to feel discouraged from the project with how much conflicting information I've been finding.

I'm staggering my sources between blogs of local practitioners and scholarly articles (accessed through my college's EBSCOHost), as well as avoiding Wikipedia like the plague, but I still keep hitting this wall. Some of the disparities are small, such as differing accounts of what types of animals each god would transform into or what other gods they're related to (or how they're related), but some of them are massive.

For example, The Morrigan from Celtic mythology has got to be the most elusive thing that I've researched in my life, creative writing or otherwise. Many sources list her as a triple goddess, but not in the way that Hecate from Greek mythology is. Instead, the three goddesses can either be depicted as three entirely separate beings with a unified goal, or they can be depicted as one goddess with several different focused facets to her. But even the separate beings rumored to make up The Morrigan differ greatly depending on the sources I choose.

I know this has been a long post, but I guess what I'm asking is how far should I go into researching these gods? I'm already 20-30 sources deep in with each of the ones I've planned on incorporating, but I'm unsure how to address the inconsistencies I've been finding online and I'm trying my best to avoid appropriating my depictions.