Finding out why they don't like Christians might be a place to start.
Many Christian missionaries that come from the first world have a reputation of insulting the religion, faith, culture, and ways of life of non-Christians living in the developing world. This is one reason many people groups dislike Christians. In the villages we work in, missionaries have been known to mock the people's cultural practices, call their god a product of satan or a moon god, and tell them they have to give up their traditions in order to be saved. I have personally witnessed this, and worse.
Before any Christian goes into a village that is foreign to them to evangelize, they need to first take at least a year to study the religious beliefs, language, and culture of the people. They also need to spend time in the village and immerse themselves in the culture and participate in the daily lives of the people for a while before sharing the Gospel. Chances are the people that are going to be evangelized have already heard the gospel at least once, so a missionary who takes the time that is necessary to form a meaningful relationship with them shows that they truly love them and care about them. Going into a village and sharing Christ's love through action will go a lot farther in leading people towards Christ than rushing into a village spouting out a bunch of scripture and pointing out the people's errors without knowing much, if anything, about them and their culture beforehand.
I've shared the following on this forum in the past, but I think it is relevant to this thread.
Sharing the gospel is about planting, watering, and faith. When it comes to us sharing the Gospel, our job is to plant and water seeds. It's God who makes things grow.
"What then is Apollos? And what is Paul? Servants through whom you believed, even as the Lord gave opportunity to each one. I planted, Apollos watered, but God was causing the growth. So then neither the one who plants nor the one who waters is anything, but God who causes the growth. Now he who plants and he who waters are one; but each will receive his own reward according to his own labor. For we are God’s fellow workers; you are God’s field, God’s building." (1 Corinthians 3:5-9)
It's the Holy Spirit that's doing the work of reaching the unbeliever, not us. We are simply the ones who share the gospel. In many cases the results may seem disappointing, but we should not be discouraged. God has not called us to convert people but to share the gospel. No one expects a seed to produce a harvest the same day that seed is planted, so in the same way, we should not expect to see immediate fruit from our evangelizing.
We can only do our part, which is to share the gospel and love the people as Christ loves us. We have no idea what God is doing in the lives of all the people we encounter and/or share the gospel with, and we may never know. Someone we share the gospel with today may or may not come to Christ, but they may share what we have told them about Jesus with someone else in the future, at which time the Holy Spirit convicts that person; a person we have never encountered or may never meet.
In addition to sharing the gospel, we need to also remember as personal witnesses to Jesus Christ and the gospel, living our lives in a Christlike manner and treating others with a Christ-like attitude is of utmost importance. The simple acts of showing kindness, love, and compassion towards those who are lost may be all it takes to eventually lead them to the Truth. Living by example is at the foundation and perhaps one of the most crucial components of our personal witness to Christ to others. Most everyone in the unbelieving world has heard about Jesus, some many times over, but they may not have seen Him in action even once.