Christians will eventually meet a conundrum with yoga and their own religion. Awakening kundalini, reaching samadhi, self realisation, none of these are valid methods within the Abrahamic faiths to “save their soul” or are even recognised as steps on that road. Even the concept of a soul that has been created and given to you by God is foreign in Hinduism. Krishna clearly states in the Bhagavad Gita, there was never a time when I did not exist, nor was there a time when you did not exist.
There is no reincarnation in Christianity, you either accept the lord Jesus in this life and follow his commendments or you will suffer in hell for the rest of eternity. A devout Christian can only partake in yoga as a curiousity, but not as a path towards liberation in the Christian vision of the word. Not if he is being true to his own faith. It is possible though that with practice of authentic yoga, which is just another way of saying practicing of Hinduism, a Christian will gradually move away from his abrahamic belief system and realise Brahman.
The Christian in this thread says, he does not want to honour hindu gods. One may not realise, but by practicing yoga one is honouring the lineage of teachers which goes back to adinatha or Shiva himself according to the yoga tradition, while the practice of hatha yoga itself is a worship of Shiva and Shakti.