How do you feel about christian politicians making laws that make alcohol harder to come by ("no selling alcohol on Sunday" - though it's largly dead now - wasn't an atheist's idea)?

I'm against that law, but I'm for people being able to elect politicians that represent their desire for such laws. What I'm strongly against is the rule of the "enlightened" elite, that decides for people what laws are good for them and what laws aren't. The only way to avoid that is to have a system of government known as "representation". And laws such as "no booze on Sundays" are the price that we have to pay for that.

christian voters for the most part vote republican

Not as overwhelmingly as you think. There are a lot of Christian Dems. Moreover, there has recently took shape a string "green" movement among Christians that brings them closer to Democratic party.

democratic doctrine aligns better with the christian one

There are many more differences then similarities - see below.

help poor people

Yes, but there two different ways of helping poor people

Christian(Jewish/Muslim/Buddist): a beleiver voluntarily donates some of his money to organize free food/shelter/free education in his parish.

Democrate: government takes away part of your property to support people who do not wish to work. In return, these people vote for the government.

Note the difference.

give away your wealth

Don't confuse Christian Bible with the actual doctrine. Christians today (especially those of Protestant denominations) absolutely do not beleive that they need to give away their wealth to achive salvation.

and lead a humble but righteous existance

And how would that be a part of Democratic doctrine??