FWIW, the LDS isn't really Christian. The theological differences are just too vast. Indeed, AFAIK, while the Catholic Church recognizes the baptism of many Protestant sects, it does not recognize the validity of LDS baptism. So a convert to Catholicism from the LDS must be baptized as part of his conversion.
It's a pity the LDS church got there first on baptising the dead. Maybe there's some scope for baptising the unborn though.