Re: I will say only La ilaha Il lalaah.
I understand what you are saying, however, i think there is a disconnect here.
If I were to ask you what is the concise statement that establishes you as a muslim.
Would you say that it is just “La Ilaha il-Allah”. Do you believe that it is sufficient? or do you think one should add the part of “Muhammad-ur-rasool Allah”.
It is true that you will not find the whole combination in one place in Quran. There can be many reasons for it, not the least of which is that Allah addresses Prophet Muhammad :saw: by his name only three or four times in quran. HE has mostly addressed him with his “laqabs” or other names.
Now if you believe that Muhammad :saw: is ineed Allah’s rasool, why do you think it is so bothersome to say it?