Who believes in evolution?

[Vitruvian-Man]

I know plenty of scientists with "post-secondary education",

who believe in the existence of a diety and the validity of evolution concomitantly.

I'm assuming you meant a deity? lol.

And what pray-tell was these people's beliefs prior to attending a post secondary institution? Undeniably all their childhoods were filled with religion.

IMO, the people you know / are referring to, aren't viewing science through an impartial perspective. They're allow their personal beliefs and opinions to cloud their judgment. Are there plenty of people like this? -- absolutely.

Religious Fanatics will debate this to death. Ultimately all it comes down to is faith in God vs. Reason, and fact.