The answer to each of those contradictions is simple, they are not doing it right. Two millenia of human 'interpretation', plus the natural corruption in any human endeavour have created a haze of sorts around what is real and true.

No Christian church or denomination will ever be perfect until the Second Coming, and then only because Christ will be in charge (no interpretation or haze allowed).

Christ's real message is Love, and His commandment to us is to love each other. Anything that divides or pits men against each other, especially based on minor issues of doctrine, is not truly Christian.

Beaucoup hypocrisy out there, everywhere you look. As long as fallible man is in charge, his nature will affect everything he does leaving him less than perfect.