Do you encounter those who claim to believe the entire Bible and have never been troubled or doubtful about any part of it? Does that make you wonder if they have actually read it? Peter said of the writings of Paul that they were hard to understand even though they were scripture.
If one apostle can say this of another, then can you expect to breeze through my word? It is likely that any who claim to have never struggled with scripture have never been tested by it. You live in a real world and need to depend on my word in your daily life. It will stand the scrutiny and your faith will emerge stronger for the tests you encounter.