Demi Lovato has posted a series of messages on twitter claiming God keeps ''throwing crap'' at her but her faith and belief in the Supreme Being never waver.

Demi Lovato says God keeps "throwing crap" at her to test her.

The 19-year-old singer - who was admitted to rehab in November 2010 to receive three months treatment for an eating disorder and self-harming - has posted a series of posts on twitter complaining about the seemingly endless trials and tribulations in her life.

Despite the difficulties she has been experiencing, the former 'Sonny with a Chance' star insists her faith in God doesn't waver because she knows "he's gonna pull me through it all".

he's gonna pull me through it all

She tweeted: "Sometimes it seems like God just keeps throwing crap my way and I get SO angry with him ... But there's never a doubt in my mind He's gonna pull me through it all. I know you're there God. But umm ... Really dude? He never fails to show me He's by my side though. Even in the tough times. #Godstuff. (sic)"

Although she has been contemplating God and her faith, the 'Skyscraper' hitmaker claims he isn't very religious bur more of a spiritual person.

She added: "I'm not very religious but I'm VERY spiritual and I DO believe in God. I'm not perfect or preaching! Just tweeting... :) Just keep swimming. (sic)"