Well, according to the "saved by deeds" denominations of Christianity, you'd likely end up in Hell by killing babies.
Not if you sincerely repent before you snuff it. As long as you get that bit right you can massacre all the babies you like.

According to the "saved by grace alone" ones, you'd end up in Heaven as long as you have faith when you die.
Even better. You don't even have to repent. You just have to believe. Awesome.

According to Calvinists, you killing babies is the proof that you were not destined to Heaven since you were created.
Ok, let's give Calvinism a miss then. Doesn't sound like any fun at all.

According to Scientology, you become Xenu's lieutenant ^_^

Devious, treacherous, murderous, neanderthal, sub-human of the West.