That if they will go to a church they will be saved through Christ. Although this may certainly be true, it is not what Jesus commanded us to do. To him give all the prophets witness, that through his name whosoever believeth in him shall receive remission of sins. We are the ones that are supposed to do the teaching to the unsaved of the world. You may say that you are not qualified to teach the unsaved about Christianity.
Lets look at some more scripture about being unsure.
Moses was doubtful as well. Here is what the Lord told him. Now therefore go, and I will be with thy mouth, and teach thee what thou shalt say. God will place the Holy Spirit within you. The Holy Spirit will speak through you.