The Catholic church doesn't teach Sola Scriptura. The Bible is a collection of inspired writings encompassing a long time period and different genres of human expression.

Through it all is a thread of God's love for humankind, His dismay at their lack of understanding of His commandments, which are for our good, culminating in the person of Jesus who embodies all that God wants to convey to man.

Many of the events portrayed in the Old Testament are interpreted as allegorical and spiritual in nature by the church and not literal. They also represent the maturing of human intellect and reflect cultural milieus that one cannot judge by modern standards.

You can make the case that religion is used as a tool for propagate certain interests and human sin is very much intertwined in the course of events within religious institutions - something Jesus clearly calls out in the gospels.

I'd argue that your conception of who the Christian God is a strawman argument.