Yes, on our (America's) dime.
Poor you. Does the light shine in your world?
I fail to get your point. Are you complaining that the tax payer is being 'burdened' by the growth of the African catholic church?
If that is the case you are mistaken. That is so far from the truth it is somewhat ludicrous. While billions are spent by the government in military aid to countries like Egypt, nothing goes towards building catholic churches in Africa (or anywhere else in the world for that matter). The only connection between taxes and Catholicism is that Catholic parishes in the US get tax breaks.
And if you mean that the American parish member, instead of the taxpayer, is giving dimes for (Catholic) church growth you are still wrong. While many protestant churches give a lot towards missionary/church-building activities (a big portion of protestant missionary funds come from this avenue), the American catholic church is not a major contributor to church growth around the world by any measure. Goodness, several Catholic parishes in the US are going bankrupt (and applying for bankruptcy protection and/or selling off church property) due to lack of giving.
And anyways, most churches in Africa (sepcially Catholic churches) normally ask for priests ....and then do the building and everything else through local fundraisers and free labor and materials. The only thing they ask for is a priest to be sent once the facilities are up.
However I guess ignorance is a great bastion for many, such as you, to seek shelter from.