My mother and I are in a disagreement about a certain suitor that has asked for my hand in marriage. My mom wants me to continue talking to him while I have already spoken to him several times and believe that we do not share the same values, seems lacks in religion, is not Shia, amongst other things.

My mother is very disappointed at me and has been pressuring me to speak to him more as he wants to take things further.

Is it wrong for me to disobey her in this?

Your mother cannot force you to marry someone you don’t want to marry. However, you must go out of our way to decrease her disappointment. Tell her you’ll try. Show her you care about her opinion. Be more loving and kind to her, and serve her. But in the end it’s your call whether you want to marry this person or not.