Re
Jon,
I'll answer your questions according to how I run Paladin's in my games. I'll give you a little background first.
A Paladin's power comes from his pure spirit as well as his deity. Purity of spirit is something that must be maintained by following strict personal ideals that do not allow corruption and sin to enter the heart. This means that Paladins should avoid lying, womanizing, gambling, overindulgence of any kind, slothfulness, and any other type of behavior that opens them up to corruption or sin. They should have a very well-defined idea of what honor and duty mean, and the definition should be shared within the faith so that there is no personal interpretation allowed. These are the kinds of ideals I expect the Paladin to uphold to maintain their purity of spirit, and thus keep their Paladin status.
1. Why does Pelor care if his paladins lie, if by doing so they promote good? Why would he take away their power?
Paladin's of Pelor care because they must ensure that there own spirit is not corrupted by any lies they tell. They must ensure that lying does not become a habit for overcoming their enemies. They must be sure they do not use the methods of their enemy to overcome their enemy. The lack of lying is a very personl thing.
Pelor would not take their power away. They would have violated their personal code of conduct expected of their knightly or holy order, and thus have lost faith in themselves and their purity of spirit. By losing their faith in themselves, they would lose their Paladin abilities and thus be nothing more than a normal holy warrior (Regular fighter) in service to Pelor.
2. Why would a Paladin of Wee Jas lose his abilities if he passed by a peasant being attacked by a demon, because the paladin was ordered by his king to go with all haste and report to someone?
I am not a strict one-step alignment person. There is nothing in the philosophy of Wee Jas to indicate that they should have Paladin orders. I would not allow a follower of Wee Jas to be a Paladin in my campaigns.
Paladins of Wee Jas should not exist. Only rules absolutists would allow such a Paladin to exist, though Wee Jas philosophy would not warrant the existence of a Paladin order.
I think being a Paladin is more of a mind set than simply picking the right god.
I believe a Paladin picks their god as much as the god picks the Paladin.
A person who has the mindset to be a Paladin will only pick a God who strongly supports at least one aspect of the Paladin's alignment and does not conflict with the other. For example, a person who wants to be a Paladin might pick St. Cuthbert as a god because Cuthbert is strongly focused on justice and order, while at the same time seems to more inclined towards the goodly part of justice and order. Thus, a person inclined to be a Paladin would look at such a god as a worthy deity.
Whereas a person inclined to be a Paladin would not look upon Fharlangan as a worthy god to serve because he is too transient and lacking in a strong focus on either law or goodness to serve.
The thing I don't see many people taking into account in this thread is that only certain people would be willing and able to take up the mantle of Paladinhood. Those people by their very nature would not seek out gods with chaotic or non-good alignments or philosophies because they would not agree with those alignments or philosophies.
Just remember, a person who is willing and able to become a Paladin chooses the god as much as the god chooses them. Paladin is a mindset and not just a class. You can be a regular fighter in service to a god to be a holy warrior, most holy warriors are just regular fighters who serve a god. Some become divine champions if you play FR, most do not.
Truly, a Paladin is an uncorrupted person who serves a deity of ultimate good or ultimate order, preferably both. They are literally the embodiement of all that is good and orderly in the world, and others in society can look to them as an example of how to be a good human being free of vices and corruption. This is the reason that lawful good is really the only alignment for a Paladin.
Why do you think that even in the Deities and Demigods Sir Launcelot was a fallen Paladin, and that only Sir Galahad was the Paladin class, even King Arthur was merely a fighter. Sir Galahad was the only uncorrupted person free of sin in all the lands of Camelot, and thus, the only knight able to find the holy grail.