Hi V., =)
I didn't read any of the responses, but I read both of your messages and just wanted to add something to maybe help your situation.
I'm a Christian woman married to an Agnostic man. Prior to marrying him, I figured it would be simple to "change" him and have him become a Christian. In my efforts, I decided it would be best to hear out his thoughts on faith, religion, etc. and openly think them over (hoping he'd do the same when it was my turn). Well, I realized that his mind was a lot more open than my own. In following religion, I was very insecure to learn about anyone else's thoughts or feelings. I was quick to become defensive, finding myself offended by anything that I didn't personally believe.
In listening to my husband and actually opening my mind to the fact that there is NO WAY of actually knowing anything but what is in front of us - I was finally able to love people in a way that I believe Jesus would have wanted me to.
I no longer looked at people who weren't religious as "wrong", nor did I look at people with differing religions as "wrong". I began to understand that everyone is living life the best way they know how, and that if we're sincerely thoughtful of one another, we'll view that above all else and love each other for what we are. We'll position ourselves in a way that our judgment falls solely on our own lives, rather than judging the lives of others.
That said, your friend is in a position where her eyes are only open to what she believes in. She believes that she's trying her best to "help" her friend by leading you to God.
She honestly won't ever be able to see otherwise until she chooses to see otherwise. She'd have to open her mind to your thoughts and step out of her comfort zone, and do it honestly - in order to see anything other than what she chooses.
You're actually in a more secure position than she's in - because you don't feel threatened by differing thoughts amongst your friends... she does.
So - my advise would be to either ask her if she'd be willing to openly try to understand your thoughts and vice versa - without the need of judgment, but rather just thoughtful discussion OR that you just ignore the emails.
It all depends on how strong she is mentally and emotionally - as well as how important the friendship is to you.
As for the people who've felt obligated to spew hate - that isn't an honest representation of Christianity... so, maybe they should look into their own lives and stop butting into yours.
Take good care of yourself and your precious little family.
Good luck with your friend!