[Ali Imran]

Paul was willing to sacrifice and give all he was and all he had to help others have a personal relationship with Jesus

Paul was faithful to Jesus until the end of his life..

“I have fought the good fight, and have finished the race. I have kept the faith. Now there is in store for me the crown of righteousness, which the Lord, the righteous Judge, will award to me that day.” – 2 Timothy 4:7-8

Paul didn't say you can married 4 wives and he himself had 13 wives...
Paul did not promise that you will have an ever lasting erection and 72 virgins in heaven 

He was imprisoned and repeatedly flogged and beaten as well as stoned. He had been in danger from rivers and robbers as well as from Jews and Gentiles and false Christians. He knew many cold and sleepless nights and hungry and thirsty days. On top of it all, he was constantly anxious for all of the churches.
 
Quite contrary to the life of Prophet Muhammad isn't it....

Jesus spent 3 years preaching to the people only for his preachings to be canceled out later by Paul. 

It was indeed a waste of time.