There are several requirements when it comes to Italian Citizenship by marriage. The fact You are married to an Italian citizen doesn’t mean that you automatically qualify.
There are requirements related to the time passed since the date of Marriage: 2 years if living in Italy, 3 years if living abroad.
These times are decreased by 50% in case You have children.
There are also several requirements related to the documents needed for the application itself, like Certificate of Marriage, Criminal Background, Birth Certificate, Italian Language Certification, and so on.