It’s definitely an alliance of convenience, much as when the Nords and Orcs marched to the aid of the Dwarves at the Battle of Red Mountain. Individual Bretons and Redguards may not be happy about it, but the residents of their border towns say it’s better to have the Orcs marching against their enemies than raiding their flocks and their farms. The Redguards and Orcs have always respected each other as honorable opponents – and while the Orcs may not trust the Bretons, as a general thing, they do trust King Emeric, who’s proven reliable. And serving side-by-side is building trust between the races.
Umm... No, they haven't. Least not the Redguards.
The Order of Diagna described the Orcs as fell enemies, foul and wicked. Those aren't words you'd use to describe someone you respect. Hell, the Order of Diagna forces its initiates to play the role of the Orcs in their recreation of the siege of Orsinium as a form of hazing.
False God! This is the end... the final turn of your Wheel!