能否受到凡人的信仰吗？
就拿抓根宝来说，虽然是凡身龙魂，有着半神的实力，但是没人信仰他，而且地位还比不过一只鸡（划掉），严格的说应该还是属于凡人吧

游戏内好像没有表示过“抓根宝有半神实力”吧

是中二魔神说抓根宝有他一半力量么

这里的“受到信仰”是什么…摆个祭坛给其他人buff？当个闪亮亮的民族领袖？前者不行，不然真是神了。后者嘛…只要你成功宣(chuan)传(xiao)，以“伊斯米尔”的名义估计也能去号召些人了。

力量和认识程度……吧？

永恒且强大的Etada分裂降阶成为寿命有限的弱小凡人。在这次梯度半阶上的就是半神Ada 虽然还是永生的 但跟Etada相比起来有限性已经很明显了 不过这有限性未必是指力量。Pelinal和Morihaus是典型的半神 除此之外没有其它明确点明的半神了。
Demi-god这个词在一代和二代出现过不少次 没有明确定义 基本上只是说力量高于凡人但弱于神的个体。泰姆瑞尔人在语言的通俗使用中大概也会常用半神指强大的凡人 但这个定义起码在我看来是没有认真讨论价值的。
抓根宝即使不是塔洛斯转世 也披甲了风暴王冠 所以它就是神 但也可以是个很弱很弱的凡人 毕竟跟老奥两场大战都有队友相助 抓根宝只需要嗓门够大专心使用Dragonrend就够了。三代目也一样 刚开场连一只守卫都打不过的Nerevarine靠几张卷轴和几瓶药水也就能解放心脏完成使命 但即使再弱它还是神。
至于信仰 “龙裔”本身就是个偶像头衔了。至于有没有信徒是不是神格的标准 看语言环境吧。虫王在成神前就有一堆信徒了 所以光有信徒不能算有神格。星之孤儿大多都不为人知 但它们才是真正永恒而强大的个体 所以没信徒也可以有神格。问题是跟现世没半毛钱关系的神格再强大也没人关心。其实在三代Vivec的对话就给神下了很好的定义：
"It is like being a juggler. Things are always moving, and you learn to know where they are without even thinking about it. Only there are many, many things moving. And sometimes, like any juggler, you drop something ... It is a bit like being at once awake and asleep. Awake, I am here with you, thinking and talking. Asleep, I am very, very busy. Perhaps for other gods, the completely immortal ones, it is only like that being asleep. Out of time. Me, I exist at once inside of time and outside of it. It's nice never being dead, too. When I die in the world of time, then I'm completely asleep. I'm very much aware that all I have to do is choose to wake. And I'm alive again. Many times I have very deliberately tried to wait patiently, a very long, long time before choosing to wake up. And no matter how long it feels like I wait, it always appears, when I wake up, that no time has passed at all. That is the god place. The place out of time, where everything is always happening, all at once."

区别就是能不能链接得到光界。每个半神都是一个小型维度旅行机。龙是独特的半神，是时光机，只能在时间里旅行。