That is YOUR definition of faith. Faith is nothing but another word for trust. You can have faith in things you can prove - which is the best thing to have faith in. But, proving something requires going through a process. For many, faith in God doesn't begin as real faith, or trust. It begins as hope, and people learn to trust the more and more they see their religion working for them. For them, living their faith is the "scientific method" they use to hang on to it. You can rip that apart if you'd like, but you can certainly see the logic in that.

Ignorance is the state in which one lacks knowledge, is unaware of something or chooses to subjectively ignore information. I don't see how trusting in something that is working so far is ignorance. At the very least, it is hypothesis. At some point, the hypothesis becomes convincing and duplicatable enough to become theory. However, if there is something you have not yet considered, you are ignorant of that. But, in that sense, you are igorant ever time you count on something that you believe to be concrete. If you walk on the street not knowing what cars are coming, are you walking in ignorance - and ignorant for believing that you will make it to the other side? Hope births risk. Success births faith. We just have to be sure to consider the counter arguments and be willing to modify our conclusions if the tests come back negative at any moment.

Faith isnt ignorance, its believing without seeing.

Whenever you go to sleep each night, do you go to sleep afraid, thinking you wont wake up the next day. NO, you go to bed and say well see ya tomorrow because you have the faith that your gonna wake up the next morniing, How is that any different from having faith in God knowing that someday we will see him in heaven.