You need to examine a red truck in the Raton Canyon and then donate $500 to the cult.
The Epsilon Program in GTA 5 is a religious cult led by Cris Formage. Followers are known as epsilonists. They believe in the existence of some paradigms.
Michael is the only of the protagonists who can join the program. It allows to complete eight missions and earn more than $2,000,000. It’s better to do this before Lester’s Assassinations.
How to Become a Member of the Epsilon Program
Open the Epsilonprogram.com website using any device, click the Evaluate Your Identity banner, answer ten questions, and then click the Get Result button. You can give any answers, it won’t affect anything.
After some time, a question mark will appear on the map in the Raton Canyon. This is the starting point of the first mission.
After completing all eight missions, Michael will be able to find ten Epsilon Tracts.
You need to enter the marked room after you donate $5000 to the cult.
You need to talk with Marnie and deliver five vehicles to the Cult.
You need to find three extraterrestrial artifacts.
You need to talk with Marnie, buy the robes at epsilonprogram.com, and wear them for 10 in-game days.
You need to safely deliver the plane to the airfield in Sandy Shores.
You need to walk 5 miles in the Grand Senora Desert.