While I think religion CAN be a very important part of a person's life, mingling two faiths doesn't have to harm anyone at all. My parents raised me Catholic because they both were Catholic. The effects of that was that I was able to understand how some people view the world. I had left the faith by the time I was 14, and have settled down with Buddhism for the time. It may change someday, as I NEVER stop questioning. I am glad to have grown up in an environment in which morals were important.
I will not force Buddhism on my children. I don't think I'll even tell them about it unless they ask. I will raise my children to have morals but to always question them. I will explain the different ways God is interpreted, and let them come to their own decision. In the Baha'i faith, one is not a Baha'i practitioner until they are at least 12 (I don't remember the exact age) At a certain point, after they have studied the major world religions they can make their own decision. My friend, who grew up in a Baha'i community, said there is no pressure to choose one religion over the other. I think this sort of objective and supportive environment is appropriate for raising children. I can bet you you'll be happy if your children can talk to god in their own way, understand why someone practices a different religion, has a set of morals, and won't tell everyone else they're wrong and going to hell.