Hi Jitendra, I've only recently started digging into the religion of satanism so I don't have a firm answer for you. My previous post was to pose an idea that reflects Mccoys sentiments. That Religion is a construct to deeper expression so to answer the question in your first post
Is religion important or to spiritual development?
I believe it CAN be important. It is for some and isn't for others.
Whatever path you follow, there are basic principals throughout that help the individual live a rich and meaningful life.
I like the idea of Sufism for its defined as The Religion of the Heart.
"Sufism is the religion of the heart, the religion in which the most important thing is to seek God in the heart of mankind."
"The first way is to recognize God the divine in every person, and to care for every person with whom we come in contact, in our thought, speech, and action."
"The next way of practicing this religion is to think of the feeling of the person who is not at the moment before us. "
"The third way of realizing the Sufi principle is to recognize in one's own feeling the feeling of God, and to realize every impulse that rises in one's heart as a direction from God."
Although I'm not sure I necessarily understand or agree with everything being shared above- I do share certain values found in sufism. It's also interesting to note that there are people who claim a particular path without understanding the depth of the religion they've decided to follow. It's because of this you'll find many branches within the same religion that more and more conform to someones own idea of what it means to live a deeper life. A life that reflects their inner sanctum.
The individuals quoted in my previous post come from two seemingly different paths... Christianity and Satanism yet the words and emotions in which they share are so closely related that you can't help but wonder, what are these people tapping into? I think there's something here to take note of... That God has many names and religion is another tool created by man as an aid to understanding things we classify as spiritual.
There's a lot to discuss when it comes to religion as we're most aware. My thinking is more a long the lines.... I am me. That's my path.
