Some Christians bow their heads, some kneel, some stand, some raise their hands, and etc. The body's posture is immaterial it is the attitude that is important.
All religions do not lead to the same god, just look at the differences. Eastern religions teach reincarnation and multiple chances to reach perfection through good works and right thinking. Christianity teaches that God who is the author of our faith will bring us to perfection through Jesus Christ in one lifetime. You teach that you can pick and choose what is right while Christians believe that God mandates what is right. If Hinduism is true then even Christians get multiple chances; if Christianity is right (and it is) then Hindus are deceived and will spend an eternity in the lake of fire. So you see the paths are not the same.