Hi Willz,
Welcome to the site. I think you're getting a lot of good advice here but I'll add my bit in as well. My fiance and I are of different religions but my daughter is baptised Catholic. It was peacefully calmly done. No recriminations or arguments on either side and the joint view is when she is old enough she will make up her own mind. It will not harm your daughter to be baptised, after all many who become witnesses are first of all baptised into other religions, she will not remember it and chances are when she gets older she will have different beliefs.
But, as said before, be very careful of what you are doing. I've seen so many families broken up by these people.
Even if you don't fully agree with us, sit down and read the site a while and do some investigation.