^^ Well true... But Obito is known to tell some lies in past... so he is not credible.
Madara didn't say anything about Sage of six paths himself(wether he was mere human or God's spirit in human body)..., so he has yet to say something about it.
But even then considering that wether Sage of six paths is God's immortal spirit in human body or Human's spirit in human's body, it doesn't matter because for humans he looks like human and behave like human,s o they consider him as one of them.
Besides Why Sage of six paths as God's spirit could even write something on Uchiha Tablet which could mentions That The Sage is God's spirit..., remember that he would like to works/save humankind while acting in secret... He didn't want to reveal to all people that he was God...(Part of Ultimate God)...
If Sage wrote on tablet that he is god spirit which only took human body form, then some hungry-power people could even harder trying to recreate his power... and searching for him and his secret. If he wanted to be just passive watcher then it couldn't make sense.
Still I respect your Opinion Sir Derp, but it can go either way as I said
Anyway thanks for such interesting discussion so far