Plato originally applied "Demiurge" to Gaea (Timaeus 40) as Mother Earth. Why's it applied to Jesus?

Why are you mixing Greek mythology... the root word being MYTH... with the historical Christ. One is real the others are made up. Become a good historian when it comes to Jesus the Christ and the best known reference we have to his time here (the new testament)... I urge you. Your salvation depends on it.