The Sanatan Dharma is scientific. Consider it as a medicine. A medicine benefits all irrelevant of the fact whether it is consumed by a thief or a saint. It doesn’t discriminate, it treats the thief in the same way it treats a saint.
The Sanatan Dharma is unconditional, it doesn’t make you take an oath to be or act in a particular way. It is enough for you to be a human. You are who you are for you are acceptable.
Everyone is pure for the Sanatan Dharma. Remember that for a religious person certain things are pure while certain things are impure but for the Sanatan Dharma each and every thing is pure. You only need faith and a sense of belief for you to practise the Sanatan Dharma.