"Thus Theosophy is not a Religion, we say, but RELIGION itself, the one bond of unity, which is so universal and all-embracing that no man,
as no speck—from gods and mortal down to animals, the blade of grass and atom—can be outside of its light. Therefore, any organization or body of that name must necessarily be a UNIVERSAL BROTHERHOOD.
Were it otherwise, Theosophy would be but a word added to hundreds other such words as high-sounding as they are pretentious and empty. Viewed as a philosophy, Theosophy in its practical work is the alembic of the Mediaeval alchemist. It transmutes the apparently base metal of every ritualistic and dogmatic creed (Christianity included) into the gold of fact and truth, and thus truly produces a universal panacea for the ills of mankind. This is why, when applying for admission into the Theosophical Society, no one is asked what religion he belongs to, nor what his deistic views may be. These views are his own personal property and have nought to do with the Society. Because Theosophy can be practised by Christian or Heathen, Jew or Gentile, by Agnostic or Materialist, or even an Atheist, provided that none of these is a bigoted fanatic, who refuses to recognise as his brother any man or woman outside his own special creed or belief. Count Leo N. Tolstoy does not believe in the Bible, the Church, or the divinity of Christ; and yet no Christian surpasses him in the practical bearing out of the principles alleged to have been preached on the Mount. And these principles are those of Theosophy; not because they were uttered by the Christian Christ, but because they are universal ethics, and were preached by Buddha and Confucius, Krishna, and all the great Sages, thousands of years before the Sermon on the Mount was written. Hence, once that we live up to such theosophy, it becomes a universal panacea indeed, for it heals the wounds inflicted by the gross asperities of the Church “isms” on the sensitive soul of every naturally religious man. How many of these, forcibly thrust out by the reactive impulse of disappointment from the narrow area of blind belief into the ranks of arid disbelief, have been brought back to hopeful aspiration by simply joining our Brotherhood—yea, imperfect as it is."
Blavatsky in "Is Theosophy a Religion?" article.