My friend, I am not sure whether Mohd. saw Allah because he himslf has written that no one has seen Allah, he claims to have seen angel gabriel (how much that is true we never know). Regarding Jesus Christ & Moses there are many historical evidence like cuneiform tablets, pillar posts etc mentioning about them found by archaelogists. But Ramayana & Mahabharata are considered as poetry & not historical records. Poetry by Sage Valmiki & Sage Vyasa. Religion is a very sensitive issue and faith is always blind. If we need to know the truth then we need to collect accurate information & match it with historical evidence to prove its authencity.