The problem with your question is, that there is literally no way to be "right". Do you know how many religions there are right now? Not to mention the thousands of cults which ruled the world in the past, but have now become all but forgotten? Every single one of them claimed to be the only "right" one. Every single one preached a different truth, different rules and different punishments.

If I would like to make sure I have a good afterlife, should I be peaceful and timid, to appease the christian god, or should I drink blood out of the skulls of my enemies, so Odin will favor me at his table in Valhalla?

No religion has ever had a better claim to the "truth" than any other one. If you follow a religion, then you most likely do so, because your parents introduced you into it. This is how the fast majority of people start their religious journey. In other words, pure coincidence. If you are born in India, you come to believe in Shiva. If you are born in Denmark today, you will most likely become a christian. Had you been born in the same place a few hundred years ago, you would believe in Odin and Thor.

The only logical conclusion is, to be an atheist and live a life guided by personal morals. I try my best to be a good person. When I die and it turns out that there actually is an afterlife, a good god will honor this. Any god who would punish me for simply not knowing, which of the thousands of options is the right one to follow (and not making himself known in a way, which would eliminate such confusion), is evil. I will gladly suffer from eternal hell in that case, going down unbent and spitting in his/her/its eye.