Do I need to sing everyday to help my singing?,I sang this evening for about 3 minutes after a lot of days of not singing consistently,my singing was better in the ending minutes than in the beginning minutes. 

Regular singing (close to daily, if possible) is ideal to build consistency and improve your skills - same as any other skill! Rest days are beneficial, too. 

Please see here for more advice on your daily routine: https://www.youtube.com/watch?v=gwzvDGmHJvQ

Consistency in what please?

Consistency (or reliability) in your voice! 

Hi guys, I recently started to go to church. I want to be able to improve my confidence in singing. I don't know if I should close my eyes while singing or open them. I really don't know how to improve my confidence while singing. Is this course going to help with that?

In my experience, learning about how your voice works and trusting your technique is a great way to build confidence! Please see below for some more advice:

https://www.30daysinger.com/blog/build-confidence-as-a-singer