Secularism

Secularism is a code of duty pertaining to this life founded on considerations purely human, and intended mainly for those who find theology indefinite or inadequate, unreliable or unbelievable.

And this definition is given based on the following three essential principles :
1. The improvement of this life is by material means.
2. That science is the available providence of man.
3. That it is good to do good. Whether there be other good or not, the good of the present life is good, and it is good to seek that good.

~George Jacob Holyoake, the originator of the term “secularism”, in English Secularism ~

Secularism is a variety of utilitarian social ethic which seeks human improvement without reference to religion and exclusively by means of human reason, science and social organization. It has developed into a positive and widely adopted outlook which aims to direct all activities and institutions by a non-religious concern for the goods of the present life and for social well-being.

~Virgilius Ferm in Encyclopedia of Religion~