Religious characters are really easy to season with talk. Tack on "[deityname] willing" when discussing the success of plans with uncertain outcomes. "[deityname] commands" whatever you're doing, when you undertake an action that is especially in line with the dogma and practices of your faith. You don't cast buff spells or recovery spells, [deityname] blesses you and your friends in times of need, just as [his/her] wrath smites those on the receiving end of your debuff, damage, and save-or-die spells.
When you meet other religion-oriented characters, especially if they're regular traveling companions, argue with them. It needn't be bickering or a shouting match, but talk shop with them. Take opportunities to point out why [deityname] 's works or way is more appropriate, more effective, or more ethical than the other. When you outperform them in a given task, shun the credit and instead give it to [deityname], and when you don't, lament that [deityname] must work [his/her] miracles through such an imperfect vessel as yourself at this time.
