Flco, not meaning to butt in like a brute, but you would stand little chance against Mac. I don't know much about you, so can't tell for sure, but I believe Mac has a lot more experience than you have and probably more battle savvy.
That's not my main reason though, IF morale wouldn't hurt Mac too much, the sheer size of him would eventually pull you under. You might hold up for a while, but Mac can rebuild too fast, he can direct attacks at you from different cities, send resources from one to the next. Even if you destroy 5 of his armies, he's still got 10 other cities to attack you from. You simply don't have those capabilities. Not saying you might not hold out for a little while, especially if you have an alliance who'll actually help you a bit, but in the long run you'd stand little to no chance against him.