Salamu Alaikom Mark,
I am sorry your anonymity were uncovered, I think you would've been able to maintain it if you remained hush-hush rather than identifying yourself at the first guess and nobody would have been the wiser, but it seems you're ok with it now anyway.
I implore you Mark to remain calm and take it easy. It was not more than a couple of weeks ago that you found Islam and some people take months and years, do not be this adamant to affect change in your life and the lives of those around you. Faith has ups and downs and you will need familiarity and comfort to draw strength from when the times come when the devil comes knocking on your heart's door. He's smart and he will choose the time when you are down and alone and begin throwing seeds of doubt in you and then will say "look at what you've done, you divorced your wife and lost your daughter and you weren't even sure!" He might be smart and use another approach or dumb and use a third one but the devil came to companions of the prophet and comes to the most evil of heathens so do not think that you are immune.
Your wife might need some time to adapt, and will need some more time to accept, and will need a whole lot more of time to be remotely interested in not phasing you out when you talk about Islam. You are allowed by Islam to marry a christian, and you are already married to one who is the mother of your child. If you divorce her without validity and so precipitously you would have wrecked your home for no reason. Islam is about patience and fortitude, and there is an opportunity to gain great rewards if after a year or two or five or ten through sincere duaa and supplication and soft Da'wa your wife's heart softens and accepts Islam.
Otherwise you should know that Islamically speaking if you divorce your wife (you'll need to do that legally on the original basis of your marriage. "fulfill your contracts" Islam says. Mouthing divorce is if you married while being muslim on the way of Islam), your daughter should be in her physical custody till the day she gets married. You will be throwing away the chance of getting your daughter exposed to Islam through you, and you should be an example of a balanced human being that accepted God's true religion and therefore should be an exemplary fair individual, who understands that it is not fair to expect others to accept in exactly the same way and at the same speed whatever it is that he individually accepted.
May God grant you the best in life and in the hereafter.
brothers and sisters,
