Tell me, would you rather establish dialogue between the Muslim Brotherhood or al-Qaeda? I think we have to accept the fact that

1) Egypt is an Islamic country
2) Egypt has an amount of citizens that would like a (moderate) Islamist state.

That means that in a democratic society, to which Egypt is moving, there will be certain elements in parliament that call for an Islamic state. We have a party in the Netherlands called the SGP, or the "Staatskundig Gereformeerde Partij (Reformed Political Party) that basically want the Netherlands to become a theocracy.

Do we have to take them seriously? Yes, because people vote for them.
Are they a real threat to the Dutch secular state? No, not really.

I would expect roughly the same (although the Muslim Brotherhood has more influence in Egypt than the SGP has in the Netherlands.