Who Should I Believe?

Jesus didn't perform miracles to impress people, he performed miracles to fulfill prophecy and to prove he was who He said He was SO THAT you would know that when He teaches how to be a part of the Kingdom of Heaven, you would know He was THE authority of how to do it.
Jesus proved Himself to be God manifested in flesh so you would know who to listen to; so you would know who to follow. It's not just about what God can do for you, even Jesus showed us that. The end all be all is that Jesus is the one to look to to understand the Kingdom of Heaven, and we know that because He proved he WAs and IS God.