well, being muslims we should believe in ALLAH without seeing him.That is what our religion teach us....
Quran and Sunnah provides us proof of the existence of ALLAH.
scientists try to prove everything scientifically and philosophers take assistance of logic..
but human mind has certain limitations...we can,t perceive each and everything..
but, yes, we can feel existence of ALLAH if we only observe our routine matters.
our matters of life tells us that there is some great power behind every happening and this power is power of ALLAH...
As far as logic is concerned....in this matter logic is not enough.
Russel is supposed to b a great philosopher,who tried to draw everything logically.But i,m not satisfied with his logic in this matter.