As Christians it is not up to us that the Gospel be believed. That is the job of the Holy Spirit. It is our responsibility to present it in a manner (by what we say AND what we do) that is accurate. And to pray.
The Word: Jesus came and told his disciples, “I have been given all authority in heaven and on earth. Therefore, go and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit. Teach these new disciples to obey all the commands I have given […]