Okay, it seems this entire discussion is hung up on two things.
1. The legalism of 10%
2. Funding man made buildings.
For 1 I agree that the 10% figure was never given to gentiles, only the Jews. I agree that you don't have to give a dime to church. That being said, every time you attend a church building and don't support the ministry there you are, in effect, stealing from the congregation. It you don't attend a Christian synagogue you don't have to support it. The second you walk in that door, however, consider who is paying for you to be able to attend. Someone has to pay the bills, if it is not you it is your neighbor and is it loving your neighbor as your self if you make them carry your weight?
2. Funding man made Christian synagogues where God does not dwell. It is very clear in the bible that God does not dwell in buildings made by man. That being said, Jesus attended the Jewish synagogue regularly. Just search the NT for "synagogue". Yes, a few places it refers to a group of people such as "the synagogue of satan". In other places it appears to be a building Jesus went to the synagogue to teach" for instance. There are enough references in the NT to indicate that this was a building. The answer is symple, though, if you attend the Christian synagogue you need to support it.
This leaves the third point not listed above, the poor, widows and orphans. I think tbe bible is clear that it is the duty of the church to support them, either directly from the members of the congregation or from the church funds. I can recite the scripture where Paul says if there are any widows among you support them yourselves so the church can support the true widows, if pressed.
That all being said, I think that if you are paying less than 10% in support of the poor and/or a church home you aren't doing your christian part and other Christians are having to pay your share, or people are simply doing without. Yes, people still are starving in some places in America. If you can't find your neighbor that needs your help you simply haven't looked hard enough.