Why for the evangelical right are abortion and gay marriage seemingly the only two issues of any importance?

Why does "abortion" trump all other issues for many such voters it seems (along with gay marriage for some)? Are there not other issues to which we could cherry pick, regardless of the candidate or which party he or she belonged to, which we could deem as not "Christian"?

What's more "Christian"? Wanting to end the wars in Iraq and Afghanistan, along with attempting to work things out diplomatically with Iran or to not want to end those before-mentioned wars and seeming to be a bit more eager in adding another with regard to Iran?

What's more "Christian"? Wanting each and every person, regardless of age, gender, race, orientation, creed, etc. to have an equal opportunity when it comes to education, employment and making something of themselves in this country or to place the middle- and lower-classes of Americans at the bottom of the priority ladder and the wealthiest at the very top, claiming that their wealth will trickle down to the rest?

What's more "Christian"? Making certain that kids have quality health insurance or not making sure of this and leaving some kids vulnerable to being rejected due to pre-existing conditions, which could potentially bankrupt a family if his or her illness continues?

It puzzles me to no end how the two issues of abortion and gay marriage have dominated the voting of so many in recent election cycles. What will be of greater impact in our children's lives? Making sure they're provided with quality health care and education or making sure they don't know about two complete strangers of the same sex whom are involved romantically with one another?

Abomination is mentioned 67 times in The Bible. Some of these abominations include lying and eating meat. Does this mean that if one candidate or another isn't a vegetarian, that it would be unChristian for someone to vote for him or her?

I'm not saying one party is more "Christian" than the other, but find it kind of ridiculous when some seem to travel that very route. We can cherry pick all we want. Republicans can generalize Democrats as pro-baby killing and pro-ruining the sanctity of marriage and Democrats can generalize Republicans as greedy, selfish and war-loving. In the end, however, how can one of these two parties accurately declare that their generalized view of their own party is more "Christian" than their generalized view of the other?

Abortion is an extremely divisive issue, but why must it be so black and white? Just because a Democrat declares himself or herself as "pro-choice" doesn't mean he or she is pro-abortion. It's not like if a poll was taken where the question was asked, "Do you love abortion?" many people would enthusiastically answer yes. I have to imagine most members of both parties would say that they'd like to reduce the number of abortions. So why can't they/we meet in the middle and support further educating about sex, contraception and through time, hopefully see the number of abortions decrease, while still not taking away a woman's right to undergo such a procedure if she, her doctor and family feel it's the best option?