Assume a medieval magic world, where Gods are worshipped and the most popular God is the most worshipped. The Gods gain their power from the belief & prayers that comes from the believers, and find it easier to show their power (which causes more people to believe in them). The Gods cannot manifest physically, but they can show their powers in different ways - if a group of people want to destroy a house of the person blaspheming their God, that God will call down a lightning strike (though this is limited to the most powerful God). Or they can grant some blessings, a war God can make a person stronger and weapons become sharp (and glow,so people know they are magically enhanced). Gods basically can do some moderate magic.
However,there is a minor, almost-forgotten God who wishes to become #1. He has very few believers (lets say 5) but he needs to figure out a way to increase that number. His magic is very weak, providing a blessing to one person at a time or causing some minor rain. What should he do in order to get more worshippers?
Note : Think magic as Elemental magic and Blessing magic. A strong God can cause a flood, our God can only cause a light drizzle. Or if a strong God can cause a tornado, our God can make it moderately windy. (Of course, Gods don't want to destroy things, only if almost all the worshippers want that, then they act. Otherwise Gods mostly don't do much (though they can)). Blessing magic would be the typical DnD type... buffs. (Increase strength,health etc) A strong God would give one man the strength of 5 men, and that person would be glowing. Our God will cause a slightly noticeable difference, and some slight glowing. Same goes for weapons (making them stronger or sharper).