You don't reason with religious people.
By definition Faith can not be reasoned with. If you have faith, no one should be able to talk you out of it.
Now you CAN agree to disagree or ignore each other with someone who is religious. This suits most people just fine. But than you have Fanatics and Extremists. These are the people protesting Family Planning clinics, Refusing to fill prescriptions for 'morally questionable patients', trying to 'Cure' gays, going out into the woods and starting 'patriotic militias' who's purpose is to cleanse the country of Jews, Blacks, Mexicans, Gays, Natives, etc... These people will not allow you to ignore them. they will not ignore you if you are different. THESE are the people that there is no real reasoning with and they can be very dangerous. These people take religion and Twist it to suit there own needs. These are the people who justify the murder of an abortion doctor as 'Gods Will'.
as for politics 2 things;
1) You should be disqualified from running for public office if you hold the title Reverend, Father, Sheik, Rabi, etc... That automatically creates a conflict of interest for any government which seeks to separate church and state.
2) You should not elect anyone who places "God" before The People of his/her country. (Same reason as above)
As for the Islam Extremest VS Christian Extremest.
Islam's **most** extreme are highly publicized and criticized. They operate 'terror' groups. They cause fear. They repel people of first and second world society with there extreme measures.
Christianity's most extreme keep there heads down. They operate within political systems. They use money not to buy weapons, but to influence politicians and law makers. They find small groups to deamonize rather than large groups. This allows them to recruit larger portions of population. They too murder, but western society is geared to ignore this as a problem. Of course one or two people get arrested for the lynching of a gay man, or the murder of an abortion doctor, but the institution remains safe. This is terrorism as well. Rather than blowing up a buss full of people, and sending the message "this can happen at any time to anyone". They are assassinations. They send the message. "If you are like them, we will find you! YOU are our target. We are cold, calculated, precise, and untouchable."
Please do not mistake this as a conspiracy theory. We all know exactly who lets this happen. YOU! Yes you. and by you i mean Me too. All of us. If we want to stop religious extremism we CAN NOT focus on Islam, or Hindu, but Christianity, and the religions that are close to home!
I think this is the longest post I've done... See what you did? DO YOU SEE WHAT YOU DID ESCAPIST?!?!