http://www.gamereplays.org/demigod/replays.php?game=51&tab=upcoming&show=details&id=99021
Watched this replay, and I've got some tips.
You were playing an Oak minion build. Early on, I thought you were just not reacting to combat very well. People fighting near you, and you not engaging. I realized that you were actually only sending in your minions to do the work. This is really not a good idea, especially at level 1. Get your Axe in there and help your buddies out!
On your first trip back to base, you buy some idols and Unbreakable Boots. Getting scaled Helm + Banded + Scale Mail would probably have been better instead of the unbreakables, and you should have picked up a teleport scroll instead of maybe getting so many minions.
Nextly, you often send your minions off to fight en masse, and since you are not nearby them, you monks are not healing you. THis means that early on you are low on health when you needn't be.
At 5:09, you have a great opportunity to kill the left side tower. Full army, a few grunts, and your axe will take it down pretty quick.
6:25, another great example of you not getting your auto attack going. 2 on 1 shouldn't just include your minions. Get in there too!
At 7:50, note how the 'tower' rook here without hammer slam OR boulder roll can't finish the job in what should have been an easy kill.
8:41 You guys are now war score 4, and haven't bought the gold upgrade. This could have been pivotal.
14:11 you don't recapture the portal that sedna got from you.
16:30 you guys have a clear victory route, buy creep upgrades, and recapture that right side portal. Your entire team only manages priests. If this had been a close game, this error would have likely lost it for you.
In general, try to be more aware of the battle around you. Missing flag captures, or chances to help in combat is pretty big. Also try to work your minions and DG at the same time. Select him and go into combat with your troops, and then order just him to move away while the troops attack who is near you.
Get shield earlier, and be more aggressive. You aren't using penitence OR Surge of might... but you do have Divine justice. HOwever since most of your damage came from your minions, divine justice was almost a complete waste.
Hope this helps.