Thanks for the welcome strtman!
How long do you have?? Seriously though, if you want a thorough history on Wicca I'd start here:
https://en.m.wikipedia.org/wiki/WiccaWicca (neo pagan, witchcraft, shamanism, touch of druidism) was founded in the 50's by a man named Gardner and has incorporated a lot of the Celtic/ Germaic pagan practices which have been around 23,000 years or longer. The closest "old religion" to compare Wicca is paganism, however most Wiccans will deny any affiliation to religion, rather saying we practice an art. Hence the tie to witchcraft. A broad definition of that term is one (or group) who believes in or who practices magic...
If you ever get around to reading that link you will see that not everyone is on the same page as far as how they see fit to practice. A majority of Wiccans do however follow standards set forth by the Wiccan Rede, the short version of that being "And that it harm none, do what ye will" We usually believe in a god/goddess figurehead and that there is a grand creator that us poor humans couldn't possibly comprehend. Some say that the figureheads are just that, a focus to direct thought and manifest energy as they represent a myriad of god/goddessesses (entities).
We believe in balance; male/female, light/dark. To focus too much on one aspect will create discord in the other. As the words around my avatar state "As above, so below. As within, so without. As the universe, so the soul."...does any of this sound familiar? It seems to be a theme with psychedelic users as I'm reading the trip reports.
As far as what it does to me..I would change it to what it does for me. It has taught me to be patient, to be openminded, to be curious, to respect myself, others, and the earth. To work hard and be grateful for who and what I have.
As I stated before I believe being a Wiccan has helped tremendously with integration, post DMT. If you have any other specific questions I could answer regarding Wicca, please feel free to ask.
May you enjoy your journeys!