pls it has been over a month I applied for google AdSense but its still pending approval, pls what have I done wrong or what am I to do to be approved.

I don't know o.. Me sef wants to apply again, I run a Christian site with over 280 topics.. Will they approve me.

You simply need to wait it out. Adsense review is done by humans and they have tons of applications to review. It could take months sometimes. I have applied for over 2 weeks now and I'm just waiting.

By the way, your focus should be on getting good traffic. If you have enough traffic, you can make money using other better mediums apart from adsense.

Good luck