“People perish for lack of knowledge, because only knowledge permits assured access to reality; and reality does not adjust itself to accommodate our false beliefs, errors, or hesitations in action. Life demands a steady hand for good, and only knowledge supplies this. This is as true in the spiritual life as elsewhere.” – Dallas Willard
Not only is it critical to be able to ask and argue if Christianity is true but even more important is whether it can be known to be true.
Here’s a good place to start your search and learn how to make the case for the Christian worldview.