The reason there are so many Christian denominations and churches is in part due to interpretation of scripture. I wish everyone with reading comprehension would interpret scripture the same way but unfortunately that's not the case. I would also add that it's not unusual that Christians come to a different or expanded understanding of scripture, which in years past, they believed they full understood.
There are some things in scripture which should be plainly understood to any believer. There are many passages and teaching which for me, are a mystery.
"For now we see in a mirror, dimly, but then face to face. Now I know in part, but then I shall know just as I also am known." - 1 Cor 1:12
ONLY in part. And not nearly to the extent most FRoman Catholics seem to wish were the case.
Most of them attribute the existence of different denominations solely to differences in interpretation implying that there are that many differences in interpretation while totally ignoring any attempts to correct their wrong conclusion.
Looking at the statements of faith of most Christian/Evangelical denominations shows that there is actual very little difference between most of them and generally the differences are over minor things.