just because we were created does not mean that we were not created by another life form. we cannot look at everything that created us as god. we as humans can create and sustain things even with our limited technological knowledge. another life form could have created us, god could have created us (if it exists). unless god communicates with us or we see with our own eyes that he communicates with someone, we cannot be sure. without proof, every human being will believe what they think is true. what is certain is to believe in something that we know exists, just like we know that bitcoin exists (unless it is an illusion or a dream).