You chose to believe or to not believe, no one can make that decision for you. It is either stepping out of ignorance or being swallowed in it. Read the whole of templeofzeus.org and deprogram yourself.
Being convinved is not an immediate thing. You have to adapt. You might read it all, but I direct you to my gold/silver/bronze coins analogy I made in the 3rd paragraph. You can also read testimonials.
There is no easy path in this. The only way to convince yourself is to accumulate actual power and use for your own benefit and the benefit of the society around you. If you can achieve this successfully, there will be no need to ask for any type of confirmations as you will clearly see for yourself what is real and what is not.
its very obvious in your words that you only read, and don't practice. when it comes to spirituality you have to experience things for yourself. no argument by anyone is going to open your eyes in the way that direct experience will. if you want proof that Gods or energy are real then you need to put the knowledge you've been given into action, otherwise its empty.
do the 40 day program in its entirety, and then do a ritual to a God you feel drawn to.