How did the earliest community become Christian? Look at Acts 2.
They remained faithful to the teaching, to each other, to the breaking of bread and to prayer. They also responded in practical ways to those marginalized by church, by state and by their own addictions.
All around were energised and their community grew. They had great joy because of their sure hope of salvation even when plagued by trials.
If you believe, even without seeing, celebrate life with joy!