I disagree....
Orochimaru is not that dumb.
First of all, his main goal is not to be god, he want to know the truth. Immortality is what he wanted. If I remember correctly, Rin'negan does not grant you immortality. Which doesn't support Orochimaru's interest.
Second, Orochimaru HAS feelings. The death of his parents deeply affected him. He knew the Pain Nagato went threw, that's why he suggested to kill him off... So the pain wouldn't effect him as much as it did to Orochimaru.
Judging from the expression he had on you can easily tell how he is reminded by his past. It was Orochimaru's way of showing compassion. (Adding to, sound 5 from hidden sound)
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