We believe He forgives because He cannot and will not lie, and in His Word He tells us He is Faithful AND JUST to forgive us. I'm almost 69 years old, been a Christian since in my later twenties, and I end every day thanking God for yet another day and reviewing where I have failed to be the Christian He wants of and for me. I ask His forgiveness and He is faithful and just to follow through on His promises, one of which is His forgiveness toward me. It is much more than merely believing because I want to be forgiven. It is the assurance of His promises which tells me my honest confession to Him results in His forgiveness toward me.
So YOU get to decide on what your "honest confession" to him is.
YOU get to commit WHATEVER sin you want and only have to BELIEVE enough and you will be forgiven.
"Lord, I killed a man and I am REALLY, REALLY sorry." Poof, forgiven, no repercussions, no penance, no punishment.
Gee, that's easy. Just believe that you are forgiven NO MATTER WHAT...and you are. Poof.
You can CONTINUE down you path of sin and just have to say: Lord I am REALLY sorry. Poof. Forgiven AGAIN!
So easy to be a Protestant.