Obama and the Democrats want to totally control everything about citizen's lives. Here is a comment on why charitable giving should not be tax deductible:

Lefty truthful about Obama's real agenda on charitable contributions
Thomas Lifson
This writer at BeyondChron has this Obama policy about charitable tax deductions nailed:

Charities are concerned that reduced deductions will translate into reduced donations, hurting nonprofits just as foundation and government support declines. But nonprofits opposing this progressive reform miss the big picture. Government, not private donors, should decide how tax dollars are allocated.

Once Obama and Democrats have a socialist state established, there will be no need for charities. I'm not sure but I would expect the deduction for contributions to religious organizations to also be eliminated. With Obama in charge, there will be no need for religion.