Many secular witches tend to be eclectic in their practice, but not all eclectic witches are secular. Eclectic witches generally create their own paths from various sources of knowledge, even when they are deity centered. The positive of this is that you can pick what most calls to you as you research and learn. The pitfall is that it can sometimes feel overwhelming and it can be easy to get bogged down with too much information. It can be very rewarding if you are someone who has never felt like any one religion or approach was a good fit. That said, reconciling various paths and systems in parts can be a challenge. This is why I often suggest to new witches who would like to follow an eclectic path to spend at least a year on a single focus (deity, type of magic, etc.) before branching out to other new ways of practicing.
Secular witches are not religious. Secular witches can be spiritual. That is not unusual. There are secular witches who may invoke deities in their work but more as archetypes than for worship. Some secular witches are simply agnostic or atheist. Many non-religious witches base their practices in nature. Others base their practice in science, technomancy, chaos magic, or any other variety of non-religious disciplines. Secular witches also feel just as much a sense of wonder and joy with their craft as any other witch. The power of their practice is no less profound than any religious path. There is a great diversity in secular witchcraft and, as with any other type of practice, it comes down to a matter of personal choice. One of the greatest things about witchcraft is that it allows you to do what feels right to you. This may change over time. I've known many witches who began their practice moving in one direction and then ended up very far from where they thought they would be years later. What an adventure they had getting there though!