There is nothing wrong to call on the name of other person rather than His name, but to put hope and trust on that person rather than Him, it is never a good idea. Those great people are inspiration for us how great they were or they are but their power and strength, it all came from Him alone.

As there is a story who is told like this: long long time ago in the town called Nazareth where lived there a virgin called Mary. She was pledged to  marry to a man called Joseph. One day an angel appeared to her ans said: Greetings, you who are highly favored! The Lord is with you. The angel told Mary that she would be with a child and he should be called Jesus. How can it be since Mary was a virgin? For with God, there is nothing impossible. The baby would grow up and He will be called Messiah, the One who redeems and delivers His people from sin. And who are His people? They are those who call on His name.