I am as well suggest you to use Liquine medium as many wrote. You have liquine original or liquine details by W&N, they both are great. I use liquine original, it has yellow-brown color (has no effect on the oil tones) and a jelly structure and it is very nice and easy to use.
When you paint you have to mix 1/3 or 1/4 of liquine on 2/3 or 3/4 of oil paint on your palette. When I use it, almost all of the oil is dry after 3-4 days - which is nice.
But remember that all the advantage of oils is what they do not dry fast, therefore the painting results are of better quality because you can mix the paints right on the canvas.
All I can say is that it is this very problem which chased me away from oil paints when I was in college. "I want to take it home to show my mommy TODAY, Professor!" Yeah, that doesn't work. Hence the colored pencils. I'm very impressed with other folks' suggestions, though, and I'm glad you have so many skilled artists who can offer good advice!
Why do you give the credit to Christianity only? What about Buddhism as a religion? Or about few philosophies of martial arts? Like Thai Chi, and practices such as yoga, meditation... And so on and so forth...