Sh'ma Yisrael. Hear o' Israel, Our God is One.
There's no such thing as a trinity, that's a roman catholic dogma(dogma is teachings/laws of man, not of God)
Just as it is a roman catholic dogma that mary is the co-redemptrix. it isn't supported by the bible, it's a perverted corruption of the bible.
anyways, I would suggest you would read the old testament for yourself, and see how beatifull the law is given.
I as a christian uphold this law in my life, for it is good, righteous and just. It is more perfect than the law given in the quran, or any law on earth.
Jesus offer simply took away that you have to be punished for your sins, but never took away the law, for it's easier for heaven and earth to pass away then for one letter of the law to be done away with.
God bless,
Michael