Asalaamu Alaykum,
"There's no worse manifestation of using flawed reasoning than suicide bombing of innocent civilians and thinking that it's something that pleases God!!"
Although I agree ayman1 that suicide bombing against innocent civilians are totally haraam, and it is flawed reasoning that leads one to beleive that by doing such an act it will lead to gaining the pleasure of Allah, just the same as those who innovate in this already perfect religion, seeking therewith to gain the pleasure of Allah by the made up novelties constitutes flawed reasoning due to 'deviation' in the understanding of Islam. However, these do not categorise as being the 'worst manifestation of flawed reasoning', as surely, the rejection of Allah(the One and Only, the Eternal the Absolute, Who was not Begotten, nor did He beget and there is non comparable unto Him) is the biggest folly, the worst manifestation of evil, reasoning and is based upon conjecture and following ones own desires.
My dear Ayman1, my purpose was not to 'refute' you as such as i understand the intent of your comments in the context you gave them, but i just felt that it was best to clarify in case someone else understood the comment without their correct context, and I ask Allah to forgive me if I have said anything wrongly.
Wassalaam