Lord, have mercy! +
It may be a phase. Unfortunately, we never know. My daughter (26) and her husband (30) are very passionate, actively outspoken atheists, and I am always trying to convince myself that it's a phase, it will pass, but, in all honesty, I am not sure. My son-in-law's grandfather is over 80 already, and he still is a militant atheist... We can always pray though.