Oh but it is. Investigation is a life-long process, things you didn't know then you find out later. You buy a car, dealer says it is good, nice and shiny, you drive it and later, bit by bit it comes apart. What you didn't know was that the dealer lied to you, that it was hurricane salvage. Do you continue on believing the salesman or not. Many now ex mormons continued their investigation and found that Smith was like the car salesman - he lied to them and gave them a pile of junk to drive.
There is nothing about the Church that I haven’t heard I was very good at doing my homework and talking to the Lord for understanding of his ways!
I had turn over every rock you could think of and my faith is as strong as ever.
Two things should do is to pray daily, and study their scriptures and the Spirit of the Lord will be with you!