Having their family bombed, having no purpose to turn to, being desperate, is what makes people join terrorist groups. That western way of live, that liberalism, that freedom, secularism, is what the terrorists groups fear. Why do you think they fear it? They want attacks, they want war, we shouldn't give it to them. They need a nice big helping of peace, wealth, and education.
There's nothing wrong with peace, wealth and education, but we don't need to force Christianity or all of western culture on anyone.
Do you think peace, wealth, and education are going to appear without them? You don't create the attitudes that exist within a nation without many decades of building up attitudes and readings. You can't just transform a nation's attitudes by sticking in the framwork that already exists, you have to disrupt it. I'd prefer we encourage a secular state, being an atheist myself, or perhaps for a massive push for moderate Islam, but I don't think the US/the west has a great number of moderate islamists who are willing to go into other nations and preach/convert people. Use what we have. The end goal is to take power from ISIS/Terrorists in any way possible, and the only way to do that is to make the people of those nations absolutely hate them, and their goals, in full. The only real way to do that, to my knowledge, is to westernize them, unless you have some other way in mind?