Mankind was created directly by God with a mandate to work on this earth, fill it, and rule over it (Gen 1:28). Mankind was created male and female (Gen 1:27). Marriage is therefore between a man and a woman (Gen 2:24).
Adam and Eve sinned against God (Gen 3), and consequently, all Creation is cursed (Rom 8:21-22) and mankind is born in sin (Rom 5:12) and by nature sins against God (Rom 3:23). Mankind will therefore be judged by God at the End (Rom 2:6-8).
Salvation from sin is only possible through the man Jesus Christ (Rom 5:17-18).
We are obliged to repent of our sins (Acts 17:30-31) and to glorify God in all that we do (1 Cor 10:31).