On the first, I think you are once again - not so flagrantly this time - misrepresenting the situation. The actual petition reads as follows: That's not the same as forbidding "parental religious upbringing".
On the second, I find Dawkins's own words relevant:
Now even this is far from my own take on religion's role in upbringing. As I have said before, I have a serious disagreement with Dawkins about the role of religion in human affairs. And so do most atheists. But that doesn't matter here - on this thread we are still dealing with allegations of evangelical dogma-spreading with authoritarian political goals, that aims at removing children from religious parents' homes.
Did you read the whole petition?
We received a petition asking:
"We the undersigned petition the Prime Minister to Make it illegal to indoctrinate or define children by religion before the age of 16."
Details of Petition:
"In order to encourage free thinking, children should not be subjected to any regular religious teaching or be allowed to be defined as belonging to a particular religious group based on the views of their parents or guardians. At the age of 16, as with other laws, they would then be considered old enough and educated enough to form their own opinion and follow any particular religion (or none at all) through free thought."
http://www.pm.gov.uk/output/Page12202.asp