How can you say that?

How can I say that their is a God? Because he has always been with me and in me. How can I say Jesus is real and has risen from the dead. Because I believe and I have experience the living Jesus in my life for myself. How do I know the Holy spirit is a guide and comforter? Not only did Jesus say I will send you a comforter which is the Holy Spirit you will know that his spirit is from the Father. They are all one in the same the Trinity. Find out for yourself. Please.