From askacatholic.com.
That is not true. Rather, his cult has been suppressed (i.e. his feast has been removed from the calendar and devotion no longer encouraged) due to lack of historical evidence and prevalence of fantastic legends surrounding him.
Lack of historical evidence doesn't mean he didn't exist and therefore is not a saint, but the church has thought it prudent to de-emphasize devotion to him. By no means has he been "de-canonized" or eliminated as a Saint.
Check out these pages (you may have to scroll down):
Quick Questions (This Rock: September 1999)
Quick Questions (This Rock: March 1997)
Quick Questions (This Rock: September 2006)
So you should be OK.