Basics of Theosophy:

An esoteric group, following esoteric cosmology, claiming that the universe is ordered by the number, seven.

The founder, Blavatsky, numerous psychic and spiritualist powers.

Similarities to Buddhism and also Hinduism

No Gospel.

No Church.

God is just a principle.

Jesus is just a created being, a great teacher.

No Resurrection.

Everything is evolving.  They teach that the earth is getting better.

Humans are provisionally immortal.

Reincarnation is universal.

Karma.

Basic Tenets of Biblical Christianity:  

To compare Theosophy to Biblical Christianity, go here.

Theosophy is willingly ignorant of the totally lost condition of all human beings, the inability of human beings to do good works, and the one Holy Creator God's great gift of giving His one and only way of salvation through acceptance of the atoning work of His one, unique Son, Jesus Christ.  As a result of this willing ignorance, followers of this religion miss all the benefits of holiness, righteousness, peace, glory, love, and joy that can only be found through Jesus.  The sad result of their rebellion against God is that those who follow this course choose hell rather than heaven.