Odd, when I was a born-again Christian I was never really pro-life or against abortion because I really bellived God took all of them to Heaven.
Now that I don't have the belief of an afterlife to comfort me, and I realise that I do not have the answers about life or death, life has become precious.
Precious because it's very possible, that this is all there is, and possible that when you die, then that's it.

Really, I don't see how it could be "weird" that a person could turn pro-life when turning agnnostic. However, most people do consider it weird.

I now realise that I no longer have all the answers of life and death like religion trys to give definite answers to. I now realise that we don't KNOW what happens when we die.

Besides, after reading the Old Testament, I realise that the Bible is not pro-life anyway. There is enough "god ordained" baby slaughter to turn one's stomach!