Well my dear Ibrahim, I'm pleased abt whatever you know of the Vedas. Your quote saying God has no form is True, however the fact that He has Form is also true. Well without quoting any facts, simply by common sense of the word ALMIGHTY - meaning ABSOLUTE is ALL aspects, how can we mortals with out speculative mind which is full of ignorance and illusion limit Him to being formless !!
OK, now coming to the facts, Yes one should not believe in anything unless not proven on the basis of Shaastra/scriptures. Just the way you quoted the Veda on Supreme Lord being formless I can quote the Vedas which mention the Form of the Lord. Tell me would you take it ?? . Ok just one simple fact on the Veda, there is only One Veda, which is Perfect knowledge which was never born, and hence will never seize to exist !, and this Absulute knoweldge was described in four Parts by Shri Krishna Dwaipayana Vyas, for the understanding of the mortals, since it was known that the as the Yugas progress the human being will become more and more Spiritually Impotent. And even after scripting these, he did not feel the Bliss, and hence was suggested by his Guru - Shri Narada Muni, to write on the Pastimes of the Lord. Thus he scripted Shrimad Bhagawatam, and which is based totally on different Forms of the Lord, and at the end of Shrimad Bhagawatam, Shri Vyas says, - this is the jist of all the Vedas !!.
I still owe you the verses from the Vedas on the Form of Lord, if you are interested though!!