Religions are falsifiable (science is the un-falsifiable thing: it is a tool, not a proposition. How do you falsify a hammer? How do you falsify science?). Any decent religious system has ideas of the type, if you do X, then Y will happen. Let's investigate a bit, and see what some religions say:
Buddhism: if you follow the eight-fold path, your suffering will end. Extremely testable. If you follow the eight-fold path, and you are still suffering, then man, they led you astray.
Tantric yoga: do these exercises and meditations and eventually you will have a kundalini rising (enlightenment). So if you do them, and you don't have a kundalini rising, then you know tantra is worthless (either that or your teacher sucks).
The Bible: Those who believe shall be able to do miracles, such as drink poison and not get hurt, or heal the sick (Mark 16:17). So if you follow Christ and you can't do those things, then......yeah, you've just falsified it.
Daoism: 99% of the battle of daoism is figuring out what you are supposed to do. That is an ancient Chinese way of teaching.....but, if you ever do figure out what it is you're supposed to do, then you will be able to tap into the mysterious power of the Dao. If you figure out what you are supposed to do, and do it, and still can't tap into that power, then you've just falsified Daoism.
Mormonism: fast and pray oft, grow in humility, and you will be filled with joy and consolation. I really like Mormonism because it is even more scientific: it says all over the place things like, "if you have faith, God will give you anything that is good." It gives examples of people who became good enough that God gave them anything they asked for, and it says that you can do it too. It even directly gives an example of how to test these claims, and verify/falsify them. I like it because the more clear the promises, the more easily it is falsifiable.
See? If all you are saying is that some being out there exists who affects life on earth in some undetectable way, then yeah, it's pretty pointless. But any preacher who preaches that doesn't know his religion.