Is the way to happiness found in following Islam and allah?

All paths lead to ignorance, confusion and harm to others, no matter what religion you are talking about.  

The profession of faith in God is accomplished only by being a Muslim, living Islam here below and in the hereafter.

Islam is the only religion of Allah send down for all mankind for their way of lives from the beginning till the end of time , to lead them to be the best nation, by becoming successful both in this world and the hereafter world for entering in to paradise , the permanent abode for perfect happiness by becoming  heaven dwellers to remain therein eternally.

Yes. But you'll only know when you try it.

the Only way to Happiness if to follow Christ

you will never find happiness in the Pagan Islam

try it and see and then you'll know