"In my opinion"

As an English composition teacher, I encourage students to stay away from equivocating phrases and write boldly. Jeff Weddle points out that even more is at stake when talking Scripture:

“In my opinion” is the classic Dale Carnegie method of winning arguments and friends, supposedly. It softens the confrontation of ideas. It works quite well in many realms and I would recommend its strength properly applied.

Proper applications of this opening move work well when discussing politics, current events, top rated quarterbacks, whether beef is better than chicken and many other issues.

However, it is wrong to use this phrase when teaching Scriptural truth. Putting God’s Word on the level of opinion is blasphemy.

Indeed. Jeff's whole article is worth reading.