Although if you believe in an omnipotent god, would you believe that she/he would not give those a chance who did not here of her/him? Why the need to actively push it onto those who are currently unaware?
But for Christians, we are convinced that the Bible is true based on evidence and reason, and therefore can only believe what it teaches. For Christians, the answer is simple: everyone has sinned, God is just, and must punish sin. Lack of knowledge of God is no excuse, for everyone knows that God exists and everyone has rejected Him. No one deserves to go heaven; no one can get to heaven by anything they do. The only way to heaven is through Jesus, by trusting in Him as our only hope of forgiveness and salvation.
That is why we must go to the ends of the earth, from the largest cities to the most remote islands, to share Christianity with everyone we meet, often giving our lives to spread that message.
Sometimes is terrorism.
This is self-reflection: everyone believes what fits better to one, don't push your shit over others or risky getting killed with bows and arrows, and every now and then bombs.
Religions are very creative ancient defense mechanisms. It exists for you to have bonds to your group, for you to survive, and protecting the belief system is to protect your own. But this is not 1600 anymore, time to grow up. Take the good stuff and throw the toxic shit behind or put it all behind.