How bout this, if they are the messangers from god, why is unit 01 the devil?
the angels were messengers, the evas were a replication of adam! and they were started before the incident!
besides, how can you justify someone's soul being used as a field, or how bout defining a soul.
now as for the physics, if you think that since god plays a role that physics dont count, then nothing does, you can claim god just smites the gundams, F U, thats EVA + GOD vs. A Gundam, the only way to make it a fair fight is to drop them in this world since putting one in the other's, stacks the odds.
a true one on one battle between Eva & Gundam, no weapons, no energy just fists, it would be too close to say for certain, the gundams have alot more power and armor but the Eva's have the full range of a human so the gundams would crush the evas easily but, the eva's would walk circles around them. all in all it would depend on the battle niether could kill the other with abilities and they're too close to call without.
and if they get the spear we get sat cannons, nukes or other special weps too, no staking your team just so you can win!