Stellar high-energy radiation is a key driver of atmospheric erosion and evolution in exoplanets, directly affecting their long-term habitability. We present a comprehensive study on stellar high-energy radiation and its impact on exoplanetary atmospheres, leveraging data from the eROSITA telescope array aboard the Spektrum Rotgen Gamma (SRG) satellite. Our sample consists of 3750 main-sequence stars identified by cross-matching with Gaia DR3. Utilizing X-ray spectral fit s from the eROSITA catalog, we computed X-ray (L_X_) and combined extreme-ultraviolet (EUV) luminosities (L_EUV_), derived from scaling relationships, which we us ed to derive soft X-ray flux (XUV) fluxes at the habitable zone (F_XUV,HZ_). We find that the majority of stars in our sample are significantly more XUV-active than the Sun, with habitable zone fluxes ranging from 10^0 to 10^5^erg/cm^2^/s. The ratio of L_XUV_/L_bol_ is found to be higher for cooler, magnetically active stars, highlighting their potentially hazardous nature for planetary atmospheres. Applying the energy-limited escape model, we computed atmospheric mass-loss rates for hypothetical Earth-like planets located at the habitable zone of each star. We also present local maps for distances up to 500pc of the average XUV flux, revealing "hazard zones" where stellar radiation could significantly influence planetary atmospheric evolution. This work demonstrates the power of X-ray surveys in constraining the high-energy environments of exoplanets and underscores the critical role of stellar activity in planetary habitability.