Ramakrishna — Indian Leader born on February 18, 1836, died on August 16, 1886

Ramakrishna Paramahamsa, born Gadadhar Chatterji or Gadadhar Chattopadhyay, was an Indian mystic and yogi during the 19th-century. His religious school of thought led to the formation of the Ramakrishna Mission by his chief disciple Swami Vivekananda.Tota Puri gave him the honorific Paramahamsa... (wikipedia)

God can be realized through all paths. All religions are true. The important thing is to reach the roof. You can reach it by stone stairs or by wooden stairs or by bamboo steps or by a rope. You can also climb up by a bamboo pole.
To work without attachment is to work without the expectation of reward or fear of any punishment in this world or the next. Work so done is a means to the end, and God is the end.
God is everywhere but He is most manifest in man. So serve man as God. That is as good as worshipping God.
If you desire to be pure, have firm faith, and slowly go on with your devotional practices without wasting your energy in useless scriptural discussions and arguments. Your little brain will otherwise be muddled.
God is in all men, but all men are not in God; that is why we suffer.