Stray thoughts

Q: When I say Allah or make dua, some images comes to mind. I deny it by saying that "it is not Allah and it can't be Allah at all because Allah is Wahid and Ahad" Can you suggest any solution in the light of Qur'an hadith. Also give me reference.

Investments

Q: I had given money to a builder for investment purpose in his project he will invest money in his projects and distribute profit among investor on percentage wise. Is it permissible to invest like this?