Has Science done away with a need for God?

[Kingpin]

I wouldn't think about it in terms of "need". I think a better way to phrase that is "science explains more about how the universe works and is better for making predictions about it than God is".
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I don't think you have that quite right.  It is not just that "science explains more about how the universe works and is better for making predictions about it than God is," it is that science actually provides some explanations and predictions, whereas God explains nothing.

Saying "God did it" is not an explanation; it is a pseudo explanation, a fake explanation, because it explains nothing at all.  It is merely pretending to have an explanation.  Take the rainbow, for example.  Saying "God did it" does not explain it at all.  One does not know anything more about a rainbow after hearing that than one knew before hearing it.  Saying it is caused by the reflection and refraction of light on water droplets is giving an explanation for a rainbow.  (For those wanting more details of that explanation, start here.)

This, by the way, is one of the ways that religion impedes knowledge, as it gives people a feeling of having an explanation when they don't have one, and if you already have an explanation, you don't need to look for an explanation.

We find this presently in the question of the origins of the universe (if it has an origin).  People pretend that saying "God did it" gives an explanation, when it is no explanation at all.

So the theists who say that God is the best explanation of the origin of the universe are wrong.  Not because it isn't "best," but because it explains nothing whatsoever.  Just like the rainbow.

Pyrrho, 

While I understand what you are saying and fully agree that simply saying "God did it" is not a valid explanation as the HOW or WHAT question you also must remember that there are differing forms of explanation that are not contradictory, but both complimentary or that some things require both explanations to be fully understood.  There are mechanical explanations sure (as in your description of a rainbow), but there are are also explanations from agency.  Science can explain the how answers, but not the why.  To answer a why question fully you also need an explanation from agency.  If I present to you a pot of boiling water on a stove and then ask you the question "why is the water boiling?", science can give a detailed description of the heat causing the aggravation of the water molecules, etc, etc.  But I tell you no, it's boiling because I want a cup of tea.  These are not conflicting explanations, but both are satisfactory and answer the same question.  

You state the universe had an origin which gets us to the Kalam argument.  We've all heard it before so I won't get in to it.  I find it too often that people reject an explanation from agency when it comes to the universe, but logic dictates that it must be so in order to answer the why question.