The Old Testament people broke all laws. God is unchanging, neither does he contradict himself, the law still stands and has been strengthened under the New Covenant. Instead of a lot of 'nots' "thou shall NOT kill, thou shall NOT commit adultery" etc. we have two new positive commandments, to love God and to love our neighbour. We shall not be harming anyone at all with the 'nots' out of the way, but instead we will be helping them.
Christianity can be summed up in the Acronym J.O.Y.
J. Jesus first.
O. Others next.
Y. Yourself last.
There are many atheists who live the Christian life, for example in famine and war torn regions and although it may be a struggle at times it can be very rewarding and far less stressful than keeping hundreds of commandments that have no real beneficial effect on anyone at all.
Anyway, that is my two cents worth and I won't be responding to you any more.