Christianity isn’t the only religion facing problems from today’s secularist mindset. So are Hinduism and Buddhism. But they are different problems.
Secularist scholars themselves tend to think in Christian terms. They assume that all religions are alike, but they aren’t. They measure rates of worship attendance, finding that fewer and fewer people go to church. Well, Hinduism and Buddhism don’t really have anything like corporate worship as Christians do. They have temples where individuals and priests can meditate and perform rituals for their deities, but attendance is not obligatory and there is no group gathering.