Because passing someone else's work off as your own is plagiarism and generally considered a bad thing. It's good that you're inspired by Microsoft, but you shouldn't use that as an excuse to post their copyrighted material on other web sites, which can get the sites concerned in trouble as they're making money (indirectly, through advertising) off that material. Best bet if you want to keep the stuff is to save it on your own computer.
And the only other content generated by you is the Islam stuff. So so can maybe understand that you come across as a spammer even if that wasn't your intent. Perhaps if you want to redeem your image you can delete your signature for now (to reinstate it later) and start posting original content - answer other people's questions from your own knowledge, ask questions about gaps in your own, for instance.